src-tauri/src/commands.rs

@@ -436,7 +436,7 @@ pub async fn extract_gamut(
     state.spawn(app, id, binary, args, cwd).await
 }
 
-#[derive(Debug, Deserialize, Serialize)]
+#[derive(Debug, Deserialize, Serialize, Clone)]
 pub struct TargenConfig {
     pub colour_space: String,
     #[serde(default)]
@@ -446,6 +446,19 @@ pub struct TargenConfig {
     pub total_patches: Option<u32>,
     pub basename: String,
     pub cwd: String,
+
+    // Advanced Stage 1 options
+    pub grey_steps: Option<u32>,                  // -g
+    pub single_channel_steps: Option<u32>,        // -s
+    pub neutral_steps: Option<u32>,               // -n
+    pub preconditioning_profile: Option<String>,  // -c
+    pub neutral_concentration: Option<f64>,       // -N
+    pub ofps_high_quality: Option<bool>,          // -G
+    pub ofps_adaptation: Option<f64>,             // -A
+    pub full_spread_algorithm: Option<String>,    // "ofps"|"t"|"r"|"R"|"q"|"Q"|"i"|"I"
+    pub total_ink_limit: Option<u32>,             // -l
+    pub dark_emphasis: Option<f64>,               // -V
+    pub device_power: Option<f64>,                // -p
 }
 
 fn default_dpi() -> u32 {
@@ -470,7 +483,8 @@ pub fn build_targen_args(config: &TargenConfig) -> Vec<String> {
         "-d".to_string(),
     ];
     
-    if config.colour_space.to_lowercase() == "cmyk" {
+    let is_cmyk = config.colour_space.to_lowercase() == "cmyk";
+    if is_cmyk {
         args.push("4".to_string());
     } else {
         args.push("2".to_string()); // Default to RGB
@@ -497,6 +511,87 @@ pub fn build_targen_args(config: &TargenConfig) -> Vec<String> {
         args.push(black.to_string());
     }
 
+    if let Some(grey) = config.grey_steps {
+        if grey > 0 {
+            args.push("-g".to_string());
+            args.push(grey.to_string());
+        }
+    }
+
+    if let Some(single) = config.single_channel_steps {
+        if single > 0 {
+            args.push("-s".to_string());
+            args.push(single.to_string());
+        }
+    }
+
+    if let Some(ref precond) = config.preconditioning_profile {
+        let trimmed = precond.trim();
+        if !trimmed.is_empty() {
+            args.push("-c".to_string());
+            args.push(trimmed.to_string());
+        }
+    }
+
+    if let Some(neutral) = config.neutral_steps {
+        if neutral > 0 {
+            args.push("-n".to_string());
+            args.push(neutral.to_string());
+        }
+    }
+
+    if let Some(conc) = config.neutral_concentration {
+        if (conc - 0.50).abs() > 0.001 {
+            args.push("-N".to_string());
+            args.push(format!("{:.2}", conc));
+        }
+    }
+
+    if let Some(true) = config.ofps_high_quality {
+        args.push("-G".to_string());
+    }
+
+    if let Some(adapt) = config.ofps_adaptation {
+        args.push("-A".to_string());
+        args.push(format!("{:.2}", adapt));
+    }
+
+    if let Some(ref algo) = config.full_spread_algorithm {
+        match algo.as_str() {
+            "t" => args.push("-t".to_string()),
+            "r" => args.push("-r".to_string()),
+            "R" => args.push("-R".to_string()),
+            "q" => args.push("-q".to_string()),
+            "Q" => args.push("-Q".to_string()),
+            "i" => args.push("-i".to_string()),
+            "I" => args.push("-I".to_string()),
+            _ => {} // default is OFPS (no flag needed)
+        }
+    }
+
+    if is_cmyk {
+        if let Some(limit) = config.total_ink_limit {
+            if limit > 0 && limit <= 400 {
+                args.push("-l".to_string());
+                args.push(limit.to_string());
+            }
+        }
+    }
+
+    if let Some(dark) = config.dark_emphasis {
+        if (dark - 1.0).abs() > 0.001 {
+            args.push("-V".to_string());
+            args.push(format!("{:.2}", dark));
+        }
+    }
+
+    if let Some(power) = config.device_power {
+        if (power - 1.0).abs() > 0.001 && power > 0.0 {
+            args.push("-p".to_string());
+            args.push(format!("{:.2}", power));
+        }
+    }
+    
     args.push(config.basename.clone());
     args
 }
@@ -954,6 +1049,17 @@ mod tests {
             total_patches: None,
             basename: "my_profile".to_string(),
             cwd: "/tmp".to_string(),
+            grey_steps: None,
+            single_channel_steps: None,
+            neutral_steps: None,
+            preconditioning_profile: None,
+            neutral_concentration: None,
+            ofps_high_quality: None,
+            ofps_adaptation: None,
+            full_spread_algorithm: None,
+            total_ink_limit: None,
+            dark_emphasis: None,
+            device_power: None,
         };
         let args = build_targen_args(&config);
         assert_eq!(args, vec!["-v", "-d", "2", "-f", "800", "-e", "4", "my_profile"]);
@@ -969,6 +1075,17 @@ mod tests {
             total_patches: None,
             basename: "cmyk_profile".to_string(),
             cwd: "/tmp".to_string(),
+            grey_steps: None,
+            single_channel_steps: None,
+            neutral_steps: None,
+            preconditioning_profile: None,
+            neutral_concentration: None,
+            ofps_high_quality: None,
+            ofps_adaptation: None,
+            full_spread_algorithm: None,
+            total_ink_limit: None,
+            dark_emphasis: None,
+            device_power: None,
         };
         let args = build_targen_args(&config);
         assert_eq!(args, vec!["-v", "-d", "4", "-f", "1500", "-B", "8", "cmyk_profile"]);
@@ -984,11 +1101,94 @@ mod tests {
             total_patches: Some(400),
             basename: "draft_profile".to_string(),
             cwd: "/tmp".to_string(),
+            grey_steps: None,
+            single_channel_steps: None,
+            neutral_steps: None,
+            preconditioning_profile: None,
+            neutral_concentration: None,
+            ofps_high_quality: None,
+            ofps_adaptation: None,
+            full_spread_algorithm: None,
+            total_ink_limit: None,
+            dark_emphasis: None,
+            device_power: None,
         };
         let args = build_targen_args(&config);
         assert_eq!(args, vec!["-v", "-d", "2", "-f", "400", "draft_profile"]);
     }
 
+    #[test]
+    fn test_build_targen_args_all_advanced_flags() {
+        let config = TargenConfig {
+            colour_space: "cmyk".to_string(),
+            patch_count: 1200,
+            white_patches: Some(4),
+            black_patches: Some(4),
+            total_patches: None,
+            basename: "adv_target".to_string(),
+            cwd: "/home/user".to_string(),
+            grey_steps: Some(16),
+            single_channel_steps: Some(8),
+            neutral_steps: Some(10),
+            preconditioning_profile: Some("/profiles/precond.icc".to_string()),
+            neutral_concentration: Some(0.75),
+            ofps_high_quality: Some(true),
+            ofps_adaptation: Some(0.80),
+            full_spread_algorithm: Some("t".to_string()),
+            total_ink_limit: Some(320),
+            dark_emphasis: Some(1.5),
+            device_power: Some(1.2),
+        };
+        let args = build_targen_args(&config);
+        assert_eq!(
+            args,
+            vec![
+                "-v", "-d", "4",
+                "-f", "1200",
+                "-e", "4",
+                "-B", "4",
+                "-g", "16",
+                "-s", "8",
+                "-c", "/profiles/precond.icc",
+                "-n", "10",
+                "-N", "0.75",
+                "-G",
+                "-A", "0.80",
+                "-t",
+                "-l", "320",
+                "-V", "1.50",
+                "-p", "1.20",
+                "adv_target"
+            ]
+        );
+    }
+
+    #[test]
+    fn test_build_targen_args_rgb_ignores_ink_limit() {
+        let config = TargenConfig {
+            colour_space: "rgb".to_string(),
+            patch_count: 800,
+            white_patches: None,
+            black_patches: None,
+            total_patches: None,
+            basename: "rgb_target".to_string(),
+            cwd: "/tmp".to_string(),
+            grey_steps: None,
+            single_channel_steps: None,
+            neutral_steps: None,
+            preconditioning_profile: None,
+            neutral_concentration: None,
+            ofps_high_quality: None,
+            ofps_adaptation: None,
+            full_spread_algorithm: None,
+            total_ink_limit: Some(300), // Should be ignored for RGB
+            dark_emphasis: None,
+            device_power: None,
+        };
+        let args = build_targen_args(&config);
+        assert!(!args.contains(&"-l".to_string()));
+    }
+
     #[test]
     fn test_build_printtarg_args_i1_a4_8bit() {
         let config = PrinttargConfig {

src-tauri/src/settings.rs

@@ -18,6 +18,30 @@ pub struct ProfilingPreset {
     pub colprof_algorithm: String,
     pub colprof_quality: String,
     pub colprof_intent: Option<String>,
+
+    // Advanced Stage 1 fields
+    #[serde(default)]
+    pub grey_steps: Option<u32>,
+    #[serde(default)]
+    pub single_channel_steps: Option<u32>,
+    #[serde(default)]
+    pub neutral_steps: Option<u32>,
+    #[serde(default)]
+    pub preconditioning_profile: Option<String>,
+    #[serde(default)]
+    pub neutral_concentration: Option<f64>,
+    #[serde(default)]
+    pub ofps_high_quality: Option<bool>,
+    #[serde(default)]
+    pub ofps_adaptation: Option<f64>,
+    #[serde(default)]
+    pub full_spread_algorithm: Option<String>,
+    #[serde(default)]
+    pub total_ink_limit: Option<u32>,
+    #[serde(default)]
+    pub dark_emphasis: Option<f64>,
+    #[serde(default)]
+    pub device_power: Option<f64>,
 }
 
 #[derive(Debug, Deserialize, Serialize, Default, Clone)]
@@ -46,6 +70,17 @@ pub fn get_default_presets() -> Vec<ProfilingPreset> {
             colprof_algorithm: "l".to_string(),
             colprof_quality: "m".to_string(),
             colprof_intent: None,
+            grey_steps: None,
+            single_channel_steps: None,
+            neutral_steps: None,
+            preconditioning_profile: None,
+            neutral_concentration: None,
+            ofps_high_quality: None,
+            ofps_adaptation: None,
+            full_spread_algorithm: None,
+            total_ink_limit: None,
+            dark_emphasis: None,
+            device_power: None,
         },
         ProfilingPreset {
             id: "preset-hq-cmyk".to_string(),
@@ -62,6 +97,17 @@ pub fn get_default_presets() -> Vec<ProfilingPreset> {
             colprof_algorithm: "l".to_string(),
             colprof_quality: "h".to_string(),
             colprof_intent: None,
+            grey_steps: None,
+            single_channel_steps: None,
+            neutral_steps: None,
+            preconditioning_profile: None,
+            neutral_concentration: None,
+            ofps_high_quality: None,
+            ofps_adaptation: None,
+            full_spread_algorithm: None,
+            total_ink_limit: Some(320),
+            dark_emphasis: None,
+            device_power: None,
         },
         ProfilingPreset {
             id: "preset-draft-rgb".to_string(),
@@ -78,6 +124,17 @@ pub fn get_default_presets() -> Vec<ProfilingPreset> {
             colprof_algorithm: "l".to_string(),
             colprof_quality: "l".to_string(),
             colprof_intent: None,
+            grey_steps: None,
+            single_channel_steps: None,
+            neutral_steps: None,
+            preconditioning_profile: None,
+            neutral_concentration: None,
+            ofps_high_quality: None,
+            ofps_adaptation: None,
+            full_spread_algorithm: None,
+            total_ink_limit: None,
+            dark_emphasis: None,
+            device_power: None,
         },
         ProfilingPreset {
             id: "preset-ultra-rgb".to_string(),
@@ -94,6 +151,17 @@ pub fn get_default_presets() -> Vec<ProfilingPreset> {
             colprof_algorithm: "l".to_string(),
             colprof_quality: "u".to_string(),
             colprof_intent: None,
+            grey_steps: None,
+            single_channel_steps: None,
+            neutral_steps: None,
+            preconditioning_profile: None,
+            neutral_concentration: None,
+            ofps_high_quality: Some(true),
+            ofps_adaptation: None,
+            full_spread_algorithm: None,
+            total_ink_limit: None,
+            dark_emphasis: None,
+            device_power: None,
         },
     ]
 }
@@ -219,6 +287,17 @@ mod tests {
             colprof_algorithm: "l".to_string(),
             colprof_quality: "h".to_string(),
             colprof_intent: None,
+            grey_steps: Some(16),
+            single_channel_steps: Some(8),
+            neutral_steps: Some(10),
+            preconditioning_profile: Some("/profiles/precond.icc".to_string()),
+            neutral_concentration: Some(0.75),
+            ofps_high_quality: Some(true),
+            ofps_adaptation: Some(0.80),
+            full_spread_algorithm: Some("t".to_string()),
+            total_ink_limit: Some(320),
+            dark_emphasis: Some(1.5),
+            device_power: Some(1.2),
         };
 
         let json = export_preset_json(preset.clone()).expect("Export failed");

src/index.html

@@ -58,19 +58,31 @@
       <main class="content">
         <!-- Stage 1: targen -->
         <section id="stage-1" class="stage active">
+          <div style="display: flex; justify-content: space-between; align-items: center;">
+            <div>
               <h2>Generate Target</h2>
               <p>Configure the colour patches for your profiling target.</p>
+            </div>
+            <button type="button" id="btnToggleAllHelp" class="secondary" style="font-size: 0.75rem; padding: 4px 8px;" title="Toggle tooltip hints for all options">💡 Show Tooltip Hints</button>
+          </div>
           
-          <div class="form-container">
-            <div class="form-group">
+          <div class="form-container" id="stage1FormContainer">
+            <!-- Basic Settings -->
+            <div class="form-group has-tooltip">
               <label>Colour Space</label>
               <div class="radio-group">
                 <label><input type="radio" name="colourSpace" value="rgb" checked> RGB (Printer Driver)</label>
                 <label><input type="radio" name="colourSpace" value="cmyk"> CMYK (RIP)</label>
               </div>
+              <div class="tooltip-text">
+                Choose the device colour model for the test chart.<br>
+                • RGB (Printer Driver) – for printers driven by an RGB driver or host colour management.<br>
+                • CMYK (RIP) – for printers controlled by a RIP or when you need explicit CMYK separation.<br>
+                This sets the targen -d colourant combination (2 = Print RGB, 4 = CMYK).
+              </div>
             </div>
 
-            <div class="form-group">
+            <div class="form-group has-tooltip">
               <label>Patch Count</label>
               <select id="patchCountPreset">
                 <option value="400">Draft (400 patches)</option>
@@ -80,23 +92,36 @@
                 <option value="custom">Custom...</option>
               </select>
               <input type="number" id="patchCountCustom" value="800" min="50" max="10000" class="hidden" style="margin-top: 8px;">
+              <div class="tooltip-text">
+                Total number of colour patches that will appear in the final chart.<br>
+                Higher counts improve profile accuracy (especially in smooth gradients and near the neutrals) but increase print time, paper usage and measurement time.<br>
+                Typical guidance: 400 (draft), 800 (standard), 1500 (photo/proof), 2500+ (maximum quality). Passed to targen -f.
+              </div>
             </div>
 
             <div class="form-group">
               <label>Neutral Axis Boost (Optional)</label>
               <div class="input-row">
-                <div>
-                  <label for="whitePatches" class="sub-label">White Patches</label>
+                <div class="has-tooltip" style="flex: 1;">
+                  <label for="whitePatches" class="sub-label">White Patches (-e)</label>
                   <input type="number" id="whitePatches" min="0" max="100" placeholder="e.g. 4">
+                  <div class="tooltip-text">
+                    Number of pure-white patches included in the chart.<br>
+                    White defines the paper white point that the ICC profile is made relative to. Measuring several white patches improves robustness against noise and paper variation. Default is 4.
+                  </div>
+                </div>
+                <div class="has-tooltip" style="flex: 1;">
+                  <label for="blackPatches" class="sub-label">Black Patches (-B)</label>
+                  <input type="number" id="blackPatches" min="0" max="100" placeholder="e.g. 4">
+                  <div class="tooltip-text">
+                    Number of pure-black patches included in the chart.<br>
+                    Black is especially important for additive (RGB) devices; measuring multiple black patches improves black-point accuracy. Default is 4 for RGB and 0 for CMYK.
                   </div>
-                <div>
-                  <label for="blackPatches" class="sub-label">Black Patches</label>
-                  <input type="number" id="blackPatches" min="0" max="100" placeholder="e.g. 8">
                 </div>
               </div>
             </div>
 
-            <div class="form-group">
+            <div class="form-group has-tooltip">
               <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px;">
                 <label style="margin: 0;">Project Directory &amp; Filename</label>
                 <button type="button" id="btnOpenExisting" class="secondary" style="font-size: 0.75rem; padding: 2px 8px;" title="Open existing .ti1 or .ti2 target file">📂 Open Target...</button>
@@ -106,10 +131,156 @@
                 <button type="button" id="btnBrowse" class="secondary">Browse...</button>
               </div>
               <small id="selectedPathDisplay" class="path-display">No directory selected (using default).</small>
+              <div class="tooltip-text">
+                Base name used for all generated files (.ti1, later .ti2, .ti3, .icc/.icm) and folder where artefacts will be created.
               </div>
             </div>
 
-          <button class="primary" id="btnGenerate" disabled>Generate (.ti1)</button>
+            <!-- Collapsible Advanced Section -->
+            <details id="targenAdvancedDetails" class="advanced-section-details" style="margin-top: 10px; border: 1px solid var(--border-color, #333); border-radius: 8px; padding: 10px 14px; background: rgba(0,0,0,0.15);">
+              <summary style="font-weight: 600; cursor: pointer; display: flex; align-items: center; justify-content: space-between; user-select: none;">
+                <span>⚙️ Advanced Target Generation Options</span>
+                <span class="summary-badge" style="font-size: 0.75rem; opacity: 0.6;">Click to expand</span>
+              </summary>
+
+              <div class="advanced-content" style="margin-top: 14px; display: flex; flex-direction: column; gap: 12px;">
+                <!-- Grey & Single Channel Steps -->
+                <div class="input-row">
+                  <div class="form-group has-tooltip" style="flex: 1;">
+                    <label for="targenGreySteps" class="sub-label">Grey / Combined Axis Steps (-g)</label>
+                    <input type="number" id="targenGreySteps" min="0" max="256" placeholder="0">
+                    <div class="tooltip-text">
+                      Number of evenly-spaced steps along the combined grey axis (equal R=G=B or C=M=Y).<br>
+                      These patches improve neutral-axis rendering and are useful when device will later be used as source space. 0 = none.
+                    </div>
+                  </div>
+                  <div class="form-group has-tooltip" style="flex: 1;">
+                    <label for="targenSingleChannelSteps" class="sub-label">Single-Channel Steps (-s)</label>
+                    <input type="number" id="targenSingleChannelSteps" min="0" max="256" placeholder="0">
+                    <div class="tooltip-text">
+                      Number of steps for each individual colorant wedge (R, G, B or C, M, Y, K).<br>
+                      Useful for diagnosing per-channel non-linearity and source-space characterisation. 0 = none.
+                    </div>
+                  </div>
+                </div>
+
+                <!-- Preconditioning Profile & Neutral Axis Steps -->
+                <div class="form-group has-tooltip">
+                  <label for="targenPrecondProfile" class="sub-label">Preconditioning Profile (-c)</label>
+                  <div class="input-row has-btn">
+                    <input type="text" id="targenPrecondProfile" placeholder="Optional previous profile (.icc / .icm)">
+                    <button type="button" id="btnBrowsePrecondProfile" class="secondary">Browse...</button>
+                  </div>
+                  <div class="tooltip-text">
+                    Optional previous ICC/ICM (or MPP) profile of this or a similar device.<br>
+                    Used by targen to estimate perceptual distances, colourspace curvature and the true neutral axis. Enables adaptive OFPS and Neutral Axis Steps.
+                  </div>
+                </div>
+
+                <div class="input-row">
+                  <div class="form-group has-tooltip" style="flex: 1;">
+                    <label for="targenNeutralSteps" class="sub-label">Neutral Axis Steps (-n)</label>
+                    <input type="number" id="targenNeutralSteps" min="0" max="256" placeholder="0">
+                    <div class="tooltip-text">
+                      Number of patches placed along the true neutral axis as estimated by preconditioning profile.<br>
+                      Requires a Preconditioning Profile. Improves neutral rendering of final profile.
+                    </div>
+                  </div>
+                  <div class="form-group has-tooltip" style="flex: 1;">
+                    <label for="targenNeutralConcentration" class="sub-label">Neutral Axis Concentration (-N)</label>
+                    <div style="display: flex; align-items: center; gap: 8px;">
+                      <input type="range" id="targenNeutralConcentration" min="0.0" max="1.0" step="0.05" value="0.5" style="flex: 1;">
+                      <span id="targenNeutralConcVal" style="font-family: monospace; font-size: 0.8rem; min-width: 35px;">0.50</span>
+                    </div>
+                    <div class="tooltip-text">
+                      How strongly the patch distribution should favour the neutral axis (0 = none, 1 = maximum).<br>
+                      Default 0.5. Most effective with preconditioning profile and high OFPS Adaptation.
+                    </div>
+                  </div>
+                </div>
+
+                <!-- Quality & Algorithm -->
+                <div class="input-row">
+                  <div class="form-group has-tooltip" style="flex: 1;">
+                    <label for="targenAlgorithm" class="sub-label">Full-spread Algorithm</label>
+                    <select id="targenAlgorithm">
+                      <option value="ofps" selected>OFPS (Optimised Farthest Point Sampling - Default)</option>
+                      <option value="t">Incremental Far Point (-t)</option>
+                      <option value="r">Device Random (-r)</option>
+                      <option value="R">Perceptual Random (-R)</option>
+                      <option value="q">Device Quasi-Random (-q)</option>
+                      <option value="Q">Perceptual Quasi-Random (-Q)</option>
+                      <option value="i">Device BCC (-i)</option>
+                      <option value="I">Perceptual BCC (-I)</option>
+                    </select>
+                    <div class="tooltip-text">
+                      Algorithm used to place remaining “full-spread” patches.<br>
+                      • OFPS (default) – best evenness in most cases.<br>
+                      • Incremental Far Point – used automatically for >4 channels.<br>
+                      • Device/Perceptual random or BCC – alternative space-filling methods.
+                    </div>
+                  </div>
+                  <div class="form-group has-tooltip" style="flex: 1; display: flex; flex-direction: column; justify-content: flex-end;">
+                    <label style="cursor: pointer; display: flex; align-items: center; gap: 8px; margin-bottom: 6px;">
+                      <input type="checkbox" id="targenHighQuality">
+                      <span style="font-size: 0.85rem;">High Quality OFPS (-G)</span>
+                    </label>
+                    <div class="tooltip-text">
+                      When checked, targen runs the OFPS algorithm in “good” mode (more iterations).<br>
+                      Produces a more evenly distributed set of patches at cost of longer generation time. Recommended for final production charts.
+                    </div>
+                  </div>
+                </div>
+
+                <!-- Adaptation & Ink Limit & Tone Remapping -->
+                <div class="input-row">
+                  <div class="form-group has-tooltip" style="flex: 1;">
+                    <label for="targenAdaptation" class="sub-label">OFPS Adaptation (-A)</label>
+                    <div style="display: flex; align-items: center; gap: 8px;">
+                      <input type="range" id="targenAdaptation" min="0.0" max="1.0" step="0.05" value="0.1" style="flex: 1;">
+                      <span id="targenAdaptationVal" style="font-family: monospace; font-size: 0.8rem; min-width: 35px;">0.10</span>
+                    </div>
+                    <div class="tooltip-text">
+                      Degree to which OFPS adapts to device behaviour from preconditioning profile (0 = ignore, 1 = fully adapt).<br>
+                      Default 0.1; automatically rises to 1.0 when preconditioning profile is supplied.
+                    </div>
+                  </div>
+                  <div class="form-group has-tooltip" id="targenInkLimitGroup" style="flex: 1;">
+                    <label for="targenInkLimit" class="sub-label">Total Ink Limit / TAC (-l %)</label>
+                    <input type="number" id="targenInkLimit" min="0" max="400" placeholder="e.g. 320" disabled>
+                    <div class="tooltip-text">
+                      Maximum total ink coverage (Total Area Coverage) in percent.<br>
+                      Essential for CMYK to avoid over-inking. Set at least 10% higher than final profile TAC. Disabled in RGB mode.
+                    </div>
+                  </div>
+                </div>
+
+                <div class="input-row">
+                  <div class="form-group has-tooltip" style="flex: 1;">
+                    <label for="targenDarkEmphasis" class="sub-label">Dark Region Emphasis (-V)</label>
+                    <div style="display: flex; align-items: center; gap: 8px;">
+                      <input type="range" id="targenDarkEmphasis" min="1.0" max="4.0" step="0.1" value="1.0" style="flex: 1;">
+                      <span id="targenDarkEmphasisVal" style="font-family: monospace; font-size: 0.8rem; min-width: 35px;">1.00</span>
+                    </div>
+                    <div class="tooltip-text">
+                      Concentrates more patches toward dark tones (1.0 = none, up to 4.0 = strong).<br>
+                      Useful for devices with non-linearity or important shadow detail. Default 1.0.
+                    </div>
+                  </div>
+                  <div class="form-group has-tooltip" style="flex: 1;">
+                    <label for="targenDevicePower" class="sub-label">Device Value Power (-p)</label>
+                    <input type="number" id="targenDevicePower" min="0.1" max="4.0" step="0.1" placeholder="Linear (1.0)">
+                    <div class="tooltip-text">
+                      Optional power-like remapping applied to device values after generation.<br>
+                      Values &gt; 1 tighten spacing near 0; values &lt; 1 tighten spacing near 1. Leave empty for linear spacing.
+                    </div>
+                  </div>
+                </div>
+              </div>
+            </details>
+          </div>
+
+          <button class="primary" id="btnGenerate" disabled style="margin-top: 14px;">Generate (.ti1)</button>
           
           <details class="log-container hidden" id="targenLogContainer">
             <summary>Process Output</summary>

src/js/presets.js

@@ -152,6 +152,58 @@ export async function initPresets() {
     const blackPatches = document.getElementById("blackPatches");
     if (blackPatches) blackPatches.value = preset.black_patches !== null && preset.black_patches !== undefined ? preset.black_patches : "";
 
+    // Advanced Stage 1 controls
+    const targenGreySteps = document.getElementById("targenGreySteps");
+    if (targenGreySteps) targenGreySteps.value = (preset.grey_steps !== null && preset.grey_steps !== undefined) ? preset.grey_steps : "";
+
+    const targenSingleChannelSteps = document.getElementById("targenSingleChannelSteps");
+    if (targenSingleChannelSteps) targenSingleChannelSteps.value = (preset.single_channel_steps !== null && preset.single_channel_steps !== undefined) ? preset.single_channel_steps : "";
+
+    const targenPrecondProfile = document.getElementById("targenPrecondProfile");
+    if (targenPrecondProfile) targenPrecondProfile.value = preset.preconditioning_profile || "";
+
+    const targenNeutralSteps = document.getElementById("targenNeutralSteps");
+    if (targenNeutralSteps) targenNeutralSteps.value = (preset.neutral_steps !== null && preset.neutral_steps !== undefined) ? preset.neutral_steps : "";
+
+    const targenNeutralConcentration = document.getElementById("targenNeutralConcentration");
+    const targenNeutralConcVal = document.getElementById("targenNeutralConcVal");
+    if (targenNeutralConcentration) {
+      const conc = (preset.neutral_concentration !== null && preset.neutral_concentration !== undefined) ? preset.neutral_concentration : 0.50;
+      targenNeutralConcentration.value = conc;
+      if (targenNeutralConcVal) targenNeutralConcVal.textContent = parseFloat(conc).toFixed(2);
+    }
+
+    const targenHighQuality = document.getElementById("targenHighQuality");
+    if (targenHighQuality) targenHighQuality.checked = !!preset.ofps_high_quality;
+
+    const targenAdaptation = document.getElementById("targenAdaptation");
+    const targenAdaptationVal = document.getElementById("targenAdaptationVal");
+    if (targenAdaptation) {
+      const adapt = (preset.ofps_adaptation !== null && preset.ofps_adaptation !== undefined) ? preset.ofps_adaptation : 0.10;
+      targenAdaptation.value = adapt;
+      if (targenAdaptationVal) targenAdaptationVal.textContent = parseFloat(adapt).toFixed(2);
+    }
+
+    const targenAlgorithm = document.getElementById("targenAlgorithm");
+    if (targenAlgorithm) targenAlgorithm.value = preset.full_spread_algorithm || "ofps";
+
+    const targenInkLimit = document.getElementById("targenInkLimit");
+    if (targenInkLimit) {
+      targenInkLimit.disabled = preset.colour_space.toLowerCase() !== "cmyk";
+      targenInkLimit.value = (preset.total_ink_limit !== null && preset.total_ink_limit !== undefined) ? preset.total_ink_limit : "";
+    }
+
+    const targenDarkEmphasis = document.getElementById("targenDarkEmphasis");
+    const targenDarkEmphasisVal = document.getElementById("targenDarkEmphasisVal");
+    if (targenDarkEmphasis) {
+      const dark = (preset.dark_emphasis !== null && preset.dark_emphasis !== undefined) ? preset.dark_emphasis : 1.00;
+      targenDarkEmphasis.value = dark;
+      if (targenDarkEmphasisVal) targenDarkEmphasisVal.textContent = parseFloat(dark).toFixed(2);
+    }
+
+    const targenDevicePower = document.getElementById("targenDevicePower");
+    if (targenDevicePower) targenDevicePower.value = (preset.device_power !== null && preset.device_power !== undefined) ? preset.device_power : "";
+
     // Stage 2 controls
     const instrumentSelect = document.getElementById("instrumentSelect");
     if (instrumentSelect && preset.instrument) instrumentSelect.value = preset.instrument;
@@ -198,6 +250,40 @@ export async function initPresets() {
     const blackInput = document.getElementById("blackPatches");
     const black_patches = blackInput && blackInput.value ? parseInt(blackInput.value, 10) : null;
 
+    // Advanced Stage 1 inputs
+    const targenGreySteps = document.getElementById("targenGreySteps");
+    const grey_steps = targenGreySteps && targenGreySteps.value ? parseInt(targenGreySteps.value, 10) : null;
+
+    const targenSingleChannelSteps = document.getElementById("targenSingleChannelSteps");
+    const single_channel_steps = targenSingleChannelSteps && targenSingleChannelSteps.value ? parseInt(targenSingleChannelSteps.value, 10) : null;
+
+    const targenPrecondProfile = document.getElementById("targenPrecondProfile");
+    const preconditioning_profile = targenPrecondProfile && targenPrecondProfile.value.trim() ? targenPrecondProfile.value.trim() : null;
+
+    const targenNeutralSteps = document.getElementById("targenNeutralSteps");
+    const neutral_steps = targenNeutralSteps && targenNeutralSteps.value ? parseInt(targenNeutralSteps.value, 10) : null;
+
+    const targenNeutralConcentration = document.getElementById("targenNeutralConcentration");
+    const neutral_concentration = targenNeutralConcentration ? parseFloat(targenNeutralConcentration.value) : null;
+
+    const targenHighQuality = document.getElementById("targenHighQuality");
+    const ofps_high_quality = targenHighQuality ? targenHighQuality.checked : false;
+
+    const targenAdaptation = document.getElementById("targenAdaptation");
+    const ofps_adaptation = targenAdaptation ? parseFloat(targenAdaptation.value) : null;
+
+    const targenAlgorithm = document.getElementById("targenAlgorithm");
+    const full_spread_algorithm = targenAlgorithm && targenAlgorithm.value !== "ofps" ? targenAlgorithm.value : null;
+
+    const targenInkLimit = document.getElementById("targenInkLimit");
+    const total_ink_limit = (colour_space === "cmyk" && targenInkLimit && targenInkLimit.value) ? parseInt(targenInkLimit.value, 10) : null;
+
+    const targenDarkEmphasis = document.getElementById("targenDarkEmphasis");
+    const dark_emphasis = targenDarkEmphasis ? parseFloat(targenDarkEmphasis.value) : null;
+
+    const targenDevicePower = document.getElementById("targenDevicePower");
+    const device_power = targenDevicePower && targenDevicePower.value ? parseFloat(targenDevicePower.value) : null;
+
     const instrumentSelect = document.getElementById("instrumentSelect");
     const instrument = instrumentSelect ? instrumentSelect.value : "i1";
 
@@ -224,6 +310,17 @@ export async function initPresets() {
       patch_count,
       white_patches,
       black_patches,
+      grey_steps,
+      single_channel_steps,
+      preconditioning_profile,
+      neutral_steps,
+      neutral_concentration,
+      ofps_high_quality,
+      ofps_adaptation,
+      full_spread_algorithm,
+      total_ink_limit,
+      dark_emphasis,
+      device_power,
       instrument,
       page_size,
       bit_depth,

src/js/targen.js

@@ -18,8 +18,96 @@ export function initTargen() {
   const logContainer = document.getElementById("targenLogContainer");
   const logPre = document.getElementById("targenLog");
 
+  // Advanced controls
+  const targenGreySteps = document.getElementById("targenGreySteps");
+  const targenSingleChannelSteps = document.getElementById("targenSingleChannelSteps");
+  const targenPrecondProfile = document.getElementById("targenPrecondProfile");
+  const btnBrowsePrecondProfile = document.getElementById("btnBrowsePrecondProfile");
+  const targenNeutralSteps = document.getElementById("targenNeutralSteps");
+  const targenNeutralConcentration = document.getElementById("targenNeutralConcentration");
+  const targenNeutralConcVal = document.getElementById("targenNeutralConcVal");
+  const targenAlgorithm = document.getElementById("targenAlgorithm");
+  const targenHighQuality = document.getElementById("targenHighQuality");
+  const targenAdaptation = document.getElementById("targenAdaptation");
+  const targenAdaptationVal = document.getElementById("targenAdaptationVal");
+  const targenInkLimit = document.getElementById("targenInkLimit");
+  const targenDarkEmphasis = document.getElementById("targenDarkEmphasis");
+  const targenDarkEmphasisVal = document.getElementById("targenDarkEmphasisVal");
+  const targenDevicePower = document.getElementById("targenDevicePower");
+  const btnToggleAllHelp = document.getElementById("btnToggleAllHelp");
+  const stage1FormContainer = document.getElementById("stage1FormContainer");
+
   let currentWorkingDir = "";
 
+  // Help hints toggle
+  if (btnToggleAllHelp && stage1FormContainer) {
+    btnToggleAllHelp.addEventListener("click", () => {
+      stage1FormContainer.classList.toggle("show-all-tooltips");
+      if (stage1FormContainer.classList.contains("show-all-tooltips")) {
+        btnToggleAllHelp.textContent = "💡 Hide Tooltip Hints";
+      } else {
+        btnToggleAllHelp.textContent = "💡 Show Tooltip Hints";
+      }
+    });
+  }
+
+  // Sliders dynamic display
+  if (targenNeutralConcentration && targenNeutralConcVal) {
+    targenNeutralConcentration.addEventListener("input", (e) => {
+      targenNeutralConcVal.textContent = parseFloat(e.target.value).toFixed(2);
+    });
+  }
+  if (targenAdaptation && targenAdaptationVal) {
+    targenAdaptation.addEventListener("input", (e) => {
+      targenAdaptationVal.textContent = parseFloat(e.target.value).toFixed(2);
+    });
+  }
+  if (targenDarkEmphasis && targenDarkEmphasisVal) {
+    targenDarkEmphasis.addEventListener("input", (e) => {
+      targenDarkEmphasisVal.textContent = parseFloat(e.target.value).toFixed(2);
+    });
+  }
+
+  // Colour space change listener to enable/disable ink limit
+  colourSpaceRadios.forEach((radio) => {
+    radio.addEventListener("change", (e) => {
+      const isCmyk = e.target.value === "cmyk";
+      if (targenInkLimit) {
+        targenInkLimit.disabled = !isCmyk;
+        if (!isCmyk) {
+          targenInkLimit.value = "";
+        }
+      }
+      if (blackPatches) {
+        if (isCmyk && (!blackPatches.value || blackPatches.value === "4")) {
+          blackPatches.value = "0";
+        } else if (!isCmyk && (!blackPatches.value || blackPatches.value === "0")) {
+          blackPatches.value = "4";
+        }
+      }
+    });
+  });
+
+  // Browse preconditioning profile
+  if (btnBrowsePrecondProfile && targenPrecondProfile) {
+    btnBrowsePrecondProfile.addEventListener("click", async () => {
+      try {
+        const filePath = await invoke("select_existing_target", {
+          defaultDir: currentWorkingDir || null,
+        });
+        if (filePath) {
+          targenPrecondProfile.value = filePath;
+          if (targenAdaptation && targenAdaptation.value === "0.1") {
+            targenAdaptation.value = "1.0";
+            if (targenAdaptationVal) targenAdaptationVal.textContent = "1.00";
+          }
+        }
+      } catch (err) {
+        console.error("Failed to select preconditioning profile:", err);
+      }
+    });
+  }
+
   function updateGenerateButton() {
     const hasBasename = targetBasename && targetBasename.value.trim().length > 0;
     const hasCwd = currentWorkingDir && currentWorkingDir.trim().length > 0;
@@ -210,6 +298,17 @@ export function initTargen() {
         black_patches: (blackPatches && blackPatches.value) ? parseInt(blackPatches.value, 10) : null,
         basename: basename,
         cwd: currentWorkingDir,
+        grey_steps: (targenGreySteps && targenGreySteps.value) ? parseInt(targenGreySteps.value, 10) : null,
+        single_channel_steps: (targenSingleChannelSteps && targenSingleChannelSteps.value) ? parseInt(targenSingleChannelSteps.value, 10) : null,
+        preconditioning_profile: (targenPrecondProfile && targenPrecondProfile.value.trim()) ? targenPrecondProfile.value.trim() : null,
+        neutral_steps: (targenNeutralSteps && targenNeutralSteps.value) ? parseInt(targenNeutralSteps.value, 10) : null,
+        neutral_concentration: (targenNeutralConcentration) ? parseFloat(targenNeutralConcentration.value) : null,
+        ofps_high_quality: (targenHighQuality) ? targenHighQuality.checked : false,
+        ofps_adaptation: (targenAdaptation) ? parseFloat(targenAdaptation.value) : null,
+        full_spread_algorithm: (targenAlgorithm && targenAlgorithm.value !== "ofps") ? targenAlgorithm.value : null,
+        total_ink_limit: (colourSpace === "cmyk" && targenInkLimit && targenInkLimit.value) ? parseInt(targenInkLimit.value, 10) : null,
+        dark_emphasis: (targenDarkEmphasis) ? parseFloat(targenDarkEmphasis.value) : null,
+        device_power: (targenDevicePower && targenDevicePower.value) ? parseFloat(targenDevicePower.value) : null,
       };
 
       try {

src/styles/main.css

@@ -1155,3 +1155,36 @@ button.danger:hover {
   to { transform: rotate(360deg); }
 }
 
+/* Tooltip & Help Styling */
+.has-tooltip {
+  position: relative;
+}
+
+.tooltip-text {
+  display: none;
+  font-size: 0.78rem;
+  line-height: 1.35;
+  color: #e0e0e0;
+  background: #252530;
+  border: 1px solid #444455;
+  border-radius: 6px;
+  padding: 8px 10px;
+  margin-top: 6px;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
+  z-index: 10;
+}
+
+.has-tooltip:hover .tooltip-text,
+.has-tooltip:focus-within .tooltip-text {
+  display: block;
+}
+
+.show-all-tooltips .tooltip-text {
+  display: block !important;
+}
+
+.advanced-section-details summary::-webkit-details-marker {
+  display: none;
+}
+
+