969 lines
29 KiB
HTML
Executable File
969 lines
29 KiB
HTML
Executable File
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta content="text/html; charset=windows-1252" http-equiv="content-type">
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<title>xicclu</title>
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<meta name="author" content="Graeme Gill">
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</head>
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<body>
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<h2><b>xicc/xicclu</b> </h2>
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<h3>Summary <br>
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</h3>
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Lookup individual color values forward or inverted though an ICC profile
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table or CAL file. <b>xicclu</b> is the analogue of the icclib tool <a href="icclu.html">icclu</a>,
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but expands the capability to reverse lookup the Lut tables, and displaying
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PCS values in CIECAM02 Jab space. <b>xicclu</b> can also be used to plot
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the device value composition down the neutral axis for device profiles, or
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CAL file contents.<br>
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<br>
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Few of the options that apply to ICC profiles apply to CAL files, although
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device value options such as <b>-e</b> or <b>-E</b> will work. To lookup
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inverted CAL values, use <b>-f b</b>.<br>
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<h3>Usage Summary</h3>
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<span style="font-family: monospace;">xicclu [-options] <i>profile_or_cal</i><br>
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<a href="#v">-v level</a> Verbosity
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level 0 - 2 (default = 1)<br>
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<a href="#g">-g</a> Plot
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slice or CAL or 'vcgt' instead of looking colors up. (Default white to
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black)<br>
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<a href="#Gs">-G s:L:a:b</a> Override plot
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slice start with Lab or Jab co-ordinate<br>
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<a href="#Ge">-G e:L:a:b</a> Override plot
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slice end with Lab or Jab co-ordinate<br>
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<a href="#V">-V</a>
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Load 'vcgt' calibration tag from profile as CAL<br>
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<a href="#f">-f function</a> f = forward, b =
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backwards, g = gamut, p = preview<br>
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if
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=
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inverted forward, ib = inverted backwards<br>
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<a href="#i">-i intent</a> a =
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absolute, r = relative colorimetric,<br>
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p = perceptual, s = saturation, A = disp. abs. measurements</span><br style="font-family: monospace;">
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<span style="font-family: monospace;"> <a href="#o">-o order</a>
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n = normal (priority: lut > matrix > monochrome)<br>
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r = reverse (priority: monochrome > matrix > lut)</span><br style="font-family: monospace;">
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<span style="font-family: monospace;"> <a href="#p">-p oride</a>
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x = XYZ_PCS, X = XYZ * 100, l = Lab_PCS, L = LCh, y = Yxy, u = Yu'v'<br>
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j = CIECAM02
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Appearance Jab, J = CIECAM02 Appearance JCh<br>
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<a href="#s">-s scale</a>
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Scale device range 0.0 - scale rather than 0.0 - 1.0<br>
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<br>
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<a href="#e">-e flag</a>
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Video encode device input as:<br>
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<a href="#E">-E flag</a>
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Video decode device output as:<br>
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n normal 0..1
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full range RGB levels (default)<br>
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t (16-235)/255
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"TV" RGB levels<br>
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6 Rec601 YCbCr
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SD (16-235,240)/255 "TV" levels<br>
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7 Rec709
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1125/60Hz YCbCr HD (16-235,240)/255 "TV" levels<br>
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5 Rec709
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1250/50Hz YCbCr HD (16-235,240)/255 "TV" levels<br>
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2 Rec2020
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YCbCr UHD (16-235,240)/255 "TV" levels<br>
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C Rec2020
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Constant Luminance YCbCr UHD (16-235,240)/255 "TV" lev<br>
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<a href="#k">-k [zhxrlv]</a> Black generation: z =
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zero K,<br>
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h
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= 0.5 K, x = max K, r = ramp K (def.)<br>
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l
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= extra PCS input is portion of K locus<br>
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v
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= extra PCS input is K target value<br>
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<a href="#kp">-k p stle stpo enpo enle shape</a><br>
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stle:
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K level at White 0.0 - 1.0<br>
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stpo:
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start point of transition Wh 0.0 - Bk 1.0<br>
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enpo:
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End point of transition Wh 0.0 - Bk 1.0<br>
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enle:
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K level at Black 0.0 - 1.0<br>
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shape:
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1.0 = straight, 0.0-1.0 concave, 1.0-2.0 convex<br>
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<a href="#kq">-k q stle0 stpo0 enpo0 enle0 shape0 stle2 stpo2 enpo2
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enle2 shape2</a><br>
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Transfer
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extra
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PCS input to dual curve limits<br>
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<a href="#K">-K parameters</a> Same as -k, but target is K
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locus rather than K value itself<br>
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<a href="#l">-l tlimit</a> set total
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ink limit, 0 - 400% (estimate by default)<br>
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<a href="#L">-L klimit</a> set black
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ink limit, 0 - 100% (estimate by default)<br>
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<a moz-do-not-send="true" href="#Yc">-Y c:file.cal</a> Provide
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or overide calibration total ink curves</span><br>
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<span style="font-family: monospace;"> <a moz-do-not-send="true" href="#T">-T</a>
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Show total ink limit of device values<br>
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<a href="#a">-a</a>
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show
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actual
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target values if clipped<br>
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<a href="#b">-b</a>
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use
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CAM
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Jab for clipping<br>
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<a href="#m">-m</a>
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merge
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output processing into clut<br>
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<a href="#c">-c viewcond</a> set viewing
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conditions for CIECAM02,<br>
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either
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an enumerated choice, or a parameter:value change<br>
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pc - Critical print evaluation
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environment (ISO-3664 P1)<br>
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pp -
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Practical Reflection Print (ISO-3664 P2)<br>
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pe - Print evaluation environment
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(CIE 116-1995)<br>
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pm - Print evaluation with
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partial Mid-tone adaptation<br>
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mt - Monitor in typical work
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environment<br>
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mb - Monitor in bright work environment<br>
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md - Monitor in
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darkened work environment<br>
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jm - Projector in dim
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environment<br>
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jd - Projector in dark
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environment<br>
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pcd - Photo CD - original
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scene outdoors<br>
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ob - Original scene -
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Bright Outdoors<br>
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cx - Cut Sheet
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Transparencies on a viewing box<br>
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s:surround
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n = auto, a = average, m = dim, d = dark,<br>
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c = transparency (default average)<br>
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w:X:Y:Z
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Adapted white point as XYZ (default media white, Abs: D50)<br>
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w:x:y
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Adapted white point as x, y<br>
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a:adaptation
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Adaptation luminance in cd.m^2 (default 50.0)<br>
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b:background Background % of
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image luminance (default 20)<br>
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f:flare
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Flare
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light % of image luminance (default 1)<br>
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g:glare Glare light % of ambient (default 2)<br>
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g:X:Y:Z Glare color as XYZ (default media
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white, Abs: D50)<br>
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g:x:y FGare color as x, y<br>
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h:hkscale Helmholtz-Kohlrausch effect scale factor
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(default 1.0)<br>
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m:mtaf Mid-tone partial adaptation
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factor (default 0.0)<br>
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m:X:Y:Z Mid-tone Adaptation white as XYZ
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(default D50)<br>
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m:x:y Mid-tone Adaptation white
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as x, y <br>
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<i><a href="#p1">inoutfile</a></i> The
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input ICC profile or CAL file.<br>
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<br>
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The colors to be translated should be fed into standard
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in,<br>
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one input color per line, white space separated.<br>
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A line starting with a # will be ignored.<br>
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A line not starting with a number will terminate the
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program. </span><br>
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<h3>Flags and Parameters</h3>
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<a name="v"></a> The <b>-v</b> parameter sets the level of verbosity.
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Default is level 1, which repeats each input value, the colorspaces of input
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and output, the type of conversion algorithm used, and if the result was
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clipped. Level 2 adds prints extra information about the profile before
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doing the conversions. Level 0 turns off all verbosity, just outputting the
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results of each conversion. Use the latter to capture batch output ready for
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further processing.<br>
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<br>
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<a name="g"></a>The <b>-g</b> flag causes a plot of the device values along
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a slice through the Lab or Jab colorspace, or the contents of a CAL file or
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'vcgt' tag, rather than allowing the interactive looking up of color values.
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By default this will be the neutral axis from the white point to the black
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point, but the start and end can be overridden using the <span style="font-weight:
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bold;">-G</span> parameters. This is useful in determining the existing
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black generation in a CMYK profile, or exploring the behavior of various
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black generation options using the <b>-k</b> parameters. The profile must
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be a device profile, and the PCS must be either Lab or Jab. The default plot
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is up the neutral axis is from the white to the black point (scale 0 to
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100%), and shows the percentage of each device colorant. To examine a
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profiles B2A table black generation, use the flag <b>-fb</b> to select the
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B2A table, or to invert the A2B table, and be able to explore black
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generation behavior, use the <b>-fif</b> flag. The appropriate intent can
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be selected with the <b>-i</b> flag, as can other flags appropriate
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to the function selected. See <a href="#xg">example</a>.<br>
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If a CAL file is used, or a 'vcgt' is loaded from an ICC profile using the
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-V flag, then <b>-g</b> will simply plot the each channels calibration
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curve. It will also plot the inverse curve for <b>-f b</b>.<br>
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<br>
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<a name="Gs"></a>The <span style="font-weight: bold;">-G </span><small><span
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style="font-family: monospace;"><span style="font-weight: bold;">s:L:a:b</span></span></small>
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parameter overrides the plot slice start point of white, with some other
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point specified in Lab or Jab Profile Connection Space. The parameter must
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be a single string that combines<span style="font-weight: bold;"> s:</span>
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with the three numbers separated by the '<span style="font-weight: bold;">:'</span>
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character (no spaces).<br>
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<br>
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<a name="Ge"></a>The <span style="font-weight: bold;">-G </span><small><span
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style="font-family: monospace;"><span style="font-weight: bold;">e:L:a:b</span></span></small>
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parameter overrides the plot slice end point of black, with some other point
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specified in Lab or Jab Profile Connection Space. The parameter must be a
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single string that combines<span style="font-weight: bold;"> s:</span> with
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the three numbers separated by the '<span style="font-weight: bold;">:'</span>
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character (no spaces).<br>
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<br>
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<a name="V"></a>The <b>-V</b> flag tells xicclu to load the given ICC
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profile, and the extract the 'vcgt' display calibration curves from the
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profile. The calibration curves can then be looked up in the normal way, or
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plotted using <b>-g.</b><br>
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<br>
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<a name="f"></a> The <b>-f</b> flag selects which type of table or
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conversion is to be used. In addition to the usual four tables that can be
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accessed in a fully populated Lut based profile, two additional options are
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available in <b>xicclu</b>. One is to invert the forward table, and the
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other is to invert the backward table. For non Lut based profiles, -fif is
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equivalent to -fb, and -fib is equivalent to -ff. Note that the -fib
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combination may not be fully supported.<br>
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<br>
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<a name="i"></a> The <b>-i</b> flag selects the intent table used for a lut
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based profile. It also selects between relative and absolute colorimetric
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for non-lut base profiles.<br>
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The -A flag selects Display absolute measurement mode, where the Luminance
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tag value is used restore absolute measurement XYZ values. The PCS will be
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force to be XYZ with this selection.<br>
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<br>
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<a name="o"></a> A profile is allowed to contain more than the minimum
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number of elements or table needed to describe a certain transform, and may
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contain redundant descriptions. By default, Lut based table
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information will be used first if present, followed by matrix/shaper
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information, and only using monochrome information if it is all that is
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present. The <b>-o</b> flag, reverses this order. <br>
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<br>
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<a name="p"></a> Normally the native PCS (Profile Connection Space) of a
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device or abstract profile is used, but the <b>-p</b> flag allows this to
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be overridden: <span style="font-weight: bold;">-px</span>: XYZ (scaled to
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1.0), <span style="font-weight: bold;">-pX</span>: XYZ scaled to 100, <span
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style="font-weight: bold;">-pl</span>: L*a*b*, <span style="font-weight: bold;">-pL</span>:
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LCh, <span style="font-weight: bold;">-py</span>: Yxy space, <span style="font-weight: bold;"><span
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style="font-weight: bold;">-pu</span></span>: Yu'v' perceptual CIE 1976
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UCS diagram Yu'v' space,<span style="font-weight: bold;"> -pj</span>:
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CIECAM02 appearance space Jab, or <span style="font-weight: bold;">-pJ</span>:
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CIECAM02 appearance space JCh.<span style="font-weight: bold;"><br>
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</span>Note that the CIECAM02 output space selection by default uses the
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colorimetric table of the profile, but that the perceptual or saturation
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tables may be used by selecting them using the <span style="font-weight: bold;">-i</span>
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parameter. If the absolute colorimetric intent is chosen using <span style="font-weight:
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bold;">-ia</span> in combinations with <span style="font-weight:
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bold;">-pj</span>, then Jab with a fixed white reference is used,
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which emulates an absolute CIECAM02 Jab appearance space. <br>
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<br>
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<a name="s"></a> Usually device values are processed and displayed using a
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normalized value range between 0.0 and 1.0 Sometimes other systems scale
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them to some other range (such as 100 or 255) due to an underlying binary
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representation. The <span style="font-weight:
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bold;">-s</span> flag lets you input and display such data in its normal
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range. For instance, if your device values have a range between 0 and 255,
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use <span style="font-weight: bold;">-s 255.</span><br>
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<br>
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<a name="e"></a>The <b>-e</b> <i>flag</i> applies a Video encoding to the
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input. See <a href="collink.html#E"><b>-E</b></a> for the list of
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encodings.<br>
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<br>
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<b><a name="E"></a></b>The <b>-E</b> <i>flag</i> applies a Video encoding
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to the output. The possible encoding are:<br>
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<br>
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<small><span style="font-family: monospace;"><small><span style="font-family: monospace;">
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n
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normal RGB 0..1 full range levels (default)<br>
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t
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RGB (16-235)/255 "TV" levels<br>
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6
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Rec601 YCbCr SD (16-235,240)/255 "TV" levels<br>
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7
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Rec709 1125/60Hz YCbCr HD (16-235,240)/255 "TV" levels<br>
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5
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Rec709 1250/50Hz YCbCr HD (16-235,240)/255 "TV" levels<br>
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2
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Rec2020 YCbCr UHD (16-235,240)/255 "TV" levels<br>
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C
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Rec2020 Constant Luminance YCbCr UHD (16-235,240)/255 "TV" levels<br>
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</span></small></span></small><br>
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<a name="k"></a> When inverting a CMYK profile, (ie. using the -fif flag),
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an input PCS value can have many possible CMYK solutions. To be able to
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return a unique solution, a black level (or black inking rule) should be
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chosen. The choice here reflect similar choices in black generation
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available in other tools (eg. <a href="colprof.html">colprof</a>, <a href="collink.html">
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collink</a>), with the addition of two extra options.<br>
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<br>
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Possible arguments to the <b>-k</b> option are:<br>
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<br>
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<b> -kz</b> selects minimum black (0.0)<br>
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<b> -kh</b> selects a black value of 0.5<br>
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<b> -kx</b> selects the maximum possible black (1.0)<br>
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<b> -kr</b> selects a linear black ramp, starting at minimum black for
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highlight, and maximum black for shadow (equivalent to -kp 0 0 1 1 1). This
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is the default.<br>
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<b> -kl</b> uses an extra (fourth) value entered after the input PCS value,
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to select a black locus target between 0.0 and 1.0.<br>
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<b> -kv</b> uses an extra (fourth) value entered after the input PCS value,
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to select a black value target value between 0.0 and 1.0.<br>
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<br>
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<b><a name="kp"></a>-k p stle stpo enpo enle shape</b> allows an
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arbitrary black value ramp to be defined, consisting of a starting value
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(stle) for highlights, a breakpoint L value (stpo) where it starts to
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transition to the shadow level, an end breakpoint L (enpo) where it flattens
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out again, and the finishing black level (enle) for the shadows. There is
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also a curve parameter, that modifies the transition from stle to enle to
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either be concave (ie. the transition starts gradually and and
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finished more abruptly) using values 0.0-1.0, with 0.0 being most concave,
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or convex (the transition starts more abruptly but finishes gradually),
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using values 1.0-2.0, with 2.0 being the most convex.<br>
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<br>
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Typical black value generation curve with parameters something like: -kp 0
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.05 1 .9 .8<br>
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<br>
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<tt> 1.0 K |
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enpo<br>
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_______ enle<br>
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/<br>
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/<br>
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/<br>
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/<br>
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stle |
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------/<br>
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+-------------------<br>
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0.0 K
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0.0 stpo 1.0<br>
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White
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Black<br>
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</tt><br>
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<b><a name="kq"></a>-k q stle0 stpo0 enpo0 enle0 shape0 stle2 stpo2 enpo2
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enle2 shape2</b> is a combination of the <b>-kv</b> and <b>-kp</b>
|
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functionality, with the black being preserved in CMYK to CMYK linking, with
|
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the output black constrained to be between the first and second set of curve
|
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parameters.<br>
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<br>
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<a name="K"></a> <span style="font-weight: bold;">-K parameters.</span> Any
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of the <span style="font-weight: bold;">-k</span> options above can use the
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<span style="font-weight: bold;">-K</span> version, in which rather than an
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absolute black value target being defined by the inking rule, the black
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|
proportion out of the maximum possible for each color is defined. This makes
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the inking curve scale proportionally over the gamut, rather than clipping
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in dark chromatic regions where not much black can be added.<br>
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<tt> </tt><span style="text-decoration: underline;"></span><br>
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The <b>-g</b> flag can be used together with the <b>-fif</b> flag,
|
|
to plot out the resulting black channel behaviour for various <b>-k</b> or
|
|
<span style="font-weight: bold;">-K </span>parameter values.<br>
|
|
<br>
|
|
<b><a name="l"></a>-l</b> <i>tlimit</i> Sets the total
|
|
ink limit (TAC, Total Area Coverage) for the CMYK inverse forward lookup, as
|
|
a total percentage from 0% to 400%. If none is provided, it will be
|
|
estimated from the profile relcolor B2A table. The ink limit will be in
|
|
final raw device values if the profile includes calibration information.<br>
|
|
<br>
|
|
<b><a name="L"></a>-L</b> <i>klimit</i> Sets the black ink
|
|
limit for the CMYK inverse forward lookup, as a total percentage from 0% to
|
|
100%. If none is provided, it will be estimated from the profile relcolor
|
|
B2A table. The ink limit will be in final raw device values if the profile
|
|
includes calibration information in the .ti3 file in its 'targ' tag.<br>
|
|
<br>
|
|
<a name="Yc"></a>The <span style="font-weight: bold;">-Y c:</span><span style="font-style: italic;">file.cal</span>
|
|
parameter adds or overrides Calibration curves that will be used in the
|
|
computation of the total or black ink limit calculation. This allows the ink
|
|
limits to be computed in final raw device units.<br>
|
|
|
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<br>
|
|
<a name="T"></a>If the <b>-T</b> flag is used, then for each device value
|
|
printed, the Total Area Coverage will be displayed.<span style="font-weight: bold;"></span><br>
|
|
<br>
|
|
<a name="a"></a> If the <b>-a</b> flag is used for inverse forward lookups,
|
|
then if the target PCS value cannot be reproduced by the device (ie. it
|
|
clips), then the achievable, clipped PCS value is displayed.<br>
|
|
<br>
|
|
<a name="b"></a> If the <b>-b</b> flag is used for inverse forward lookups,
|
|
then out of gamut clipping will be performed in the CIECAM02 Jab appearance
|
|
colorspace, rather than L*a*b* colorspace.<br>
|
|
<br>
|
|
<a name="m"></a> The <b>-m</b> flag turns on an internal processing option,
|
|
in which the per device curve lookup table processing is merged into the
|
|
main multi-dimensional interpolation lut lookup.<br>
|
|
<br>
|
|
<a name="c"></a>Whenever PCS values are to be specified or displayed in
|
|
Jab/CIECAM02 colorspace, a set of viewing conditions will be used to
|
|
determine the details of the conversion. The <b>-c</b> parameter allows the
|
|
specification of the viewing conditions. Viewing conditions can be specified
|
|
in two basic ways. One is to select from the list of "pre canned",
|
|
enumerated viewing conditions, choosing one that is closest to the
|
|
conditions that are appropriate for the media type and situation.
|
|
Alternatively, the viewing conditions parameters can be specified in detail
|
|
individually. If both methods are used, them the chosen enumerated condition
|
|
will be used as a base, and its parameters will then be individually
|
|
overridden.<br>
|
|
<br>
|
|
<a name="p1"></a> The final parameter is the name of the <a href="File_Formats.html#ICC">ICC</a>
|
|
profile to be used. On the MSWindows platform a .icm extension is generally
|
|
used, and on Apple or Unix/Linux platforms a .icc extension is often used.<br>
|
|
<h3>Usage and Discussion</h3>
|
|
Typical usage for an output profile might be:<br>
|
|
<br>
|
|
xicclu -ff -ip profile.icm<br>
|
|
<br>
|
|
Normally the program is interactive, allowing the user to type in input
|
|
color values, each number separated by a space, and the resulting output
|
|
color being looked up and displayed after pressing return. To batch process
|
|
a group of color values, prepare a text file containing each input value on
|
|
a separate line, and use the input indirection facilities of your command
|
|
line shell to redirect this input file into the standard input of xicclu.
|
|
The output can be captured to a file by redirecting standard output to a
|
|
file. In most shells this would be done something like this:<br>
|
|
<br>
|
|
xicclu -ff -ip profile.icm < inputvalues.txt >
|
|
outputvalues.txt<br>
|
|
<br>
|
|
<a name="xg"></a>When plotting the neutral axis behavior, plotting the
|
|
existing B2A table behavior would typically be done something like this:<br>
|
|
<br>
|
|
xicclu -g -fb profile.icm<br>
|
|
<br>
|
|
Exploring possible black generation and ink limiting behavior might be done
|
|
like this:<br>
|
|
<br>
|
|
xicclu -g -fif -kp 0 .1 .9 1 .5 -l230 -L95 profile.icm<br>
|
|
<br>
|
|
<br>
|
|
<br>
|
|
<br>
|
|
<br>
|
|
<br>
|
|
<br>
|
|
</body>
|
|
</html>
|