988 lines
25 KiB
HTML
Executable File
988 lines
25 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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<title>chartread</title>
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<meta http-equiv="content-type" content="text/html;
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charset=windows-1252">
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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>spectro/chartread</b></h2>
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<h3>Summary</h3>
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Read a printer test chart using an instrument, to create a <a
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href="File_Formats.html#.ti3">.ti3</a> data file. The type of
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instrument is determined by the communication port selected.<br>
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<br>
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<span style="font-weight: bold;">chartread</span> can also be used
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to read transmission values, and to read display values manually.<br>
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<h3>Usage</h3>
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<tt>chartread [-options] <i>inoutfile</i></tt><tt><br>
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</tt><tt> </tt><tt><a href="#v">-v</a></tt><tt>
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Verbose
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mode</tt><tt><br>
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</tt> <tt> </tt><tt><a href="#u">-u</a></tt><tt> Emit real-time JSON stream of row patch data to stdout</tt><tt><br>
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</tt><tt> </tt><tt><a href="#c">-c listno</a></tt><tt>
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Set communication port from the
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following list (default 1)</tt><tt><br>
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</tt><tt> </tt><tt><a href="#t">-t</a></tt><tt>
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Use
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transmission
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measurement mode</tt><tt><br>
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</tt><tt> </tt><tt><a href="#d">-d</a></tt><tt>
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Use
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display
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measurement
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mode (white Y relative results)</tt><tt><br>
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</tt><tt> </tt><tt><a href="#y">-y X</a></tt><tt>
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Display type - instrument specific list to choose from.</tt><tt><br>
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</tt><tt> </tt><tt><a href="#e">-e</a></tt><tt>
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Use
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emissive
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measurement
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mode (absolute results)</tt><tt><br>
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</tt><tt> </tt><tt><a href="#p">-p</a></tt><tt>
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Measure
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patch
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by
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patch rather than strip</tt><tt><br>
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</tt><tt> </tt><tt><a href="#x">-x [lx]</a></tt><tt>
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Take
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manually entered values, either L*a*b* (-xl) or XYZ (-xx).</tt><tt><br>
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</tt><tt> </tt><tt><a href="#n">-n</a></tt><tt>
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Don't
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save spectral information (default saves spectral)</tt><tt><br>
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</tt><tt> </tt><tt><a href="#l">-l</a></tt><tt>
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Save CIE as D50 L*a*b* rather than XYZ</tt><tt><br>
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</tt><tt> </tt><tt><a href="#L">-L</a></tt><tt>
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Save CIE as D50 L*a*b* as well as XYZ</tt><tt><br>
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</tt><tt> </tt><tt><a href="#r">-r</a></tt><tt>
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Re-read
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or resume partly read chart</tt><tt><br>
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</tt><tt> </tt><tt><a href="#I">-I</a></tt><tt>
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file.cal Override
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calibration info from .ti2 in resulting .ti3</tt><br>
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<tt> </tt><tt><a href="#F">-F filter</a></tt><tt>
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Set filter configuration:</tt><tt><br>
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</tt><tt>
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n
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None (M0)</tt><tt><br>
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</tt><tt> 5
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D50 (M1)</tt><tt><br>
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</tt><tt>
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6
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D65</tt><tt><br>
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</tt><tt>
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U.V. Cut (M2)</tt><tt><br>
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</tt><tt>
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p
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Polarising filter (M3)</tt><tt><br>
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</tt><tt> </tt><tt><a href="#A">-A N|A|X|G</a></tt><tt>
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XRGA conversion (default N)</tt><tt><br>
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</tt><tt> </tt><tt><a href="#N">-N</a></tt><tt>
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Disable initial calibration of instrument unless
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essential</tt><tt><br>
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</tt><tt> </tt><tt><a href="#B">-B</a></tt><tt>
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Disable auto bi-directional strip recognition</tt><tt><br>
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</tt><tt> </tt><tt><a href="#b">-b</a></tt><tt>
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Force enable auto bi-directional strip recognition</tt><tt><br>
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</tt><tt> </tt><tt><a href="#H">-H</a></tt><tt>
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Use high resolution spectrum mode (if available)</tt><tt><br>
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</tt><tt> </tt><tt><a href="#X1">-X file.ccmx</a></tt><tt>
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Apply Colorimeter Correction Matrix</tt><tt><br>
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</tt><tt> </tt><tt><a href="#X2">-X file.ccss</a></tt><tt>
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Use Colorimeter Calibration Spectral Samples for calibration</tt><tt><br>
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</tt><tt> </tt><tt><a href="#Q">-Q observ</a></tt><tt>
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Choose CIE Observer for spectral
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data or CCSS instrument:</tt><tt><br>
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</tt><tt>
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1931_2 (def.),
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1964_10, 2015_2, 2015_10, S&B 1955_2, shaw, J&V 1978_2 or
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file.cmf</tt><tt><br>
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</tt><tt> </tt><tt><a href="#T">-T ratio</a></tt><tt>
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Modify
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strip
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patch
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consistency tolerance by ratio (if available)</tt><tt><br>
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</tt><tt> </tt><tt><a href="#S">-S</a></tt><tt>
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Suppress
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wrong
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strip
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& unexpected value warnings</tt><br>
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<tt> </tt><tt><a href="#W">-W n|h|x</a></tt><tt>
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Override
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serial port flow control: n = none, h = HW, x = Xon/Xoff</tt><tt><br>
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</tt><tt> </tt><tt><a href="#D">-D [level]</a></tt><tt>
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Print debug diagnostics
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to stderr</tt><tt><br>
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</tt><tt> </tt><i><tt><a href="#p1">inoutfile</a></tt></i><tt>
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Base name for input[</tt><tt><a
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href="File_Formats.html#.ti2">.ti2</a></tt><tt>]/output[</tt><tt><a
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href="File_Formats.html#.ti3">.ti3</a></tt><tt>] file </tt><br>
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<h3>Usage Details</h3>
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<a name="v"></a>The <b>-v</b> flag causes extra information to be
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printed out during chartread operation.<br>
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<br>
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<a name="u"></a>The <b>-u</b> flag enables real-time JSON streaming of row patch data to stdout. Each time a row is completed (either forward or reverse), a JSON object containing the expected and measured patch data, along with padding indicators, is emitted prefixed by <code>ROW_COLORS_JSON:</code>. This is designed for GUI applications wrapping chartread to display live swatches and calculate color differences during reading.<br>
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<br>
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<a name="c"></a>Normally instruments are connected via a serial
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communication port, and the port used should be selected by
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supplying the correct parameter to the <b>-c</b> flag. If you
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invoke <span style="font-weight: bold;">chartread</span> so as to
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display the usage information (i.e. "chartread -?" or "chartread
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--"), then the discovered serial ports will be listed on Windows and
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Mac OSX systems.<br>
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<br>
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<a name="t"></a>If using an Xrite DTP41T, and printing onto
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transparent or back lit media, use the <b>-t</b> flag to operate
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the instrument in transparency mode. If using a Spectrolino or
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Eye-One Pro (handheld), this triggers a fake transparency mode, that
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uses a separate backlight (such as a light box). The
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instrument will be used to calibrate the level of backlight, and use
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this to compute the transparency of the test chart samples. Note
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that for good transparency values, the backlight level needs to be
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neither too bright not too dark, should ideally be incandescent
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rather than fluorescent (since fluorescent lights often have big
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dips in their spectrum), and ideally should be of uniform brightness
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over the measurement area. If using the SpectroScanT, the <span
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style="font-weight: bold;">-t</span> flag operates the instrument
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in transparency mode, each reading being manually triggered.<br>
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<br>
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<a name="d"></a>The <span style="font-weight: bold;">-d</span> flag
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allows measuring in display mode using instruments that support this
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mode, with the brightness normalized to the white patch value in the
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test chart. While the brightness values are then relative to the
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white, the readings are otherwise absolute. This corresponds to the
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raw ICC absolute readings created by <a href="dispread.html">dispread</a>,
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and is the mode that should be used for creating a normal display
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ICC profile using manual, spot by spot readings. This can be useful
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if the display cannot be driven directly by the computer, but can be
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made manually to display the test charts.<br>
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<br>
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<a name="y"></a> The <span style="font-weight: bold;">-y</span>
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flag allows setting the Display Type. The selection typically
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determines two aspects of of the instrument operation: <span
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style="font-weight: bold;">1)</span> It may set the measuring mode
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to suite <a
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href="http://en.wikipedia.org/wiki/Comparison_of_display_technology"><span
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style="font-weight: bold;">refresh</span> or <span
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style="font-weight: bold;">non-refresh</span> displays</a>.
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Typically only LCD (Liquid Crystal) displays have a non-refresh
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nature. <span style="font-weight: bold;">2)</span> It may select an
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instrument calibration matrix suitable for a particular display
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type. The selections available depends on the type and model of
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instrument, and a list of the options for the discovered instruments
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will be shown in the <a href="ArgyllDoc.html#CmdLine">usage</a>
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information. For more details on what particular instruments support
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and how this works, see <a href="instruments.html">Operation of
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particular instruments</a>. <b>3)</b> Any installed CCSS files
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(if applicable), or CCMX files. These files are typically created
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using <a href="ccxxmake.html">ccxxmake</a>, and installed using <a
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href="oeminst.html">oeminst</a>. The default and Base Calibration
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types will be indicated in the usage.<br>
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<br>
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<a name="e"></a> If using an instrument that supports an emissive
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measurement mode (such as the Spectrolino), then the <span
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style="font-weight: bold;">-e</span> flag enables this measurement
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mode, and the values recorded will be absolute XYZ values. This can
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be used for media such as backlit film, measuring it on a lightbox,
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so as to capture the actual illumination characteristics of that
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particular media. An adaptive integration time will be used in
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devices that support it. <br>
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<br>
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<a name="p"></a> The <span style="font-weight: bold;">-p</span>
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flag causes chartread to use a spot read mode for an instrument,
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even if it is capable of faster chart reading modes such as strip
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reading. This can be useful if strip measurement patch recognition
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is not reliable for certain media.<br>
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<br>
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<a name="x"></a> The <span style="font-weight: bold;">-x</span>
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flag causes chartread to expect values to be manually entered for
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each reading, rather than using an instrument to do the
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measurements. This mode is ideal if your instrument is not
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supported by Argyll. Either XYZ or L*a*b* values can be entered,
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depending on what option follows <span style="font-weight: bold;"><span
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style="font-weight: bold;">-l</span></span>, <span
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style="font-weight: bold;">-lx</span> to specify XYZ values, or <span
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style="font-weight: bold;">-ll</span> to specify L*a*b* values.
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XYZ values are expected to be scaled to a maximum of 100. It is
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possible to navigate about the test values being measured, so as to
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do them in any order, as well as re-do values, in case of any
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mistakes.<br>
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<br>
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<a name="n"></a> <span style="font-weight: bold;">-n</span> By
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default spectral information as well as D50 standard observer XYZ
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values will be recorded for each test patch, when such readings are
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available from a device. The spectral readings allow for choosing a
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non-standard viewing illuminant, a non-standard observer model, or
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the use of the Fluorescent Paper Whitener Additive compensation when
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creating the profile. If the spectral readings are not needed, then
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prinread operation can be speeded up by specifying the <b>-n</b>
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flag.<br>
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<br>
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<a name="l"></a> <span style="font-weight: bold;">-l</span> By
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default D50 standard observer XYZ values will be recorded for each
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test patch, but if the <span style="font-weight: bold;"><span
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style="font-weight: bold;">-l</span></span> flag is used, D50
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L*a*b* values will be recorded instead.<br>
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<br>
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<a name="L"></a> <span style="font-weight: bold;">-L</span> By
|
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default D50 standard observer XYZ values will be recorded for each
|
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test patch, but if the <span style="font-weight: bold;"><span
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style="font-weight: bold;">-L</span></span> flag is used, XYZ <span
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|
style="font-weight: bold;">and </span>D50 L*a*b* values will
|
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be recorded.<br>
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|
<br>
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|
<a name="r"></a> <span style="font-weight: bold;">-r</span> By
|
|
default chartread reads the chart from scratch each time. When
|
|
reading a chart using a strip instrument or patch by patch you can
|
|
choose to finish chartread without reading all the patches, and
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|
whatever patches have been read will be saved to the output .ti3
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|
file. You can then <span style="text-decoration: underline;">resume</span>
|
|
reading the patches by using the <span style="font-weight: bold;">-r</span>
|
|
flag, in which case chartread will read the .ti3 file and set the
|
|
patches to those previously read values, allowing any unread patches
|
|
to then be read. This also works with fully read charts, and allows
|
|
re-measuring any patches or rows.<br>
|
|
<br>
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|
<a name="I"></a> <span style="font-weight: bold;">-I</span> <span
|
|
style="font-style: italic;">file.cal</span> Normally per
|
|
channel calibration curves are added to the .ti2 file using the <span
|
|
style="font-weight: bold;">printtarg -K</span> or <span
|
|
style="font-weight: bold;">-I</span> options, so that they will be
|
|
passed on to the .ti3 file by <span style="font-weight:
|
|
bold;">chartread</span>, so that <span style="font-weight: bold;">colprof</span>
|
|
is able to correctly compute total ink limits. Where the calibration
|
|
is being applied in a workflow with native calibration capability<small><span
|
|
style="font-family: monospace;"></span></small> though, it is
|
|
sometimes convenient to re-use a profile chart with different
|
|
calibration curves without going through the process of using <span
|
|
style="font-weight: bold;">printtarg</span> to re-create it. This
|
|
would mean though, that the calibration information and subsequent
|
|
ink limit calculations wouldn't be accurate. To overcome this and
|
|
allow such a scenario, the <span style="font-weight: bold;">chartread
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
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|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
-I</span> parameter allows overriding the .ti2 calibration curves
|
|
placed in the resulting .ti3 file with the actual calibration that
|
|
was used for that particular print.<br>
|
|
|
|
|
|
<br>
|
|
<a name="F"></a>The <b>-F</b> options allows configuring the
|
|
instrument to have a particular filter fitted to it. Some
|
|
instruments (i.e. the Gretag Spectrolino) allow the fitting of
|
|
various filters, such as a polarizing filter, D65 illuminant
|
|
simulation, or Ultra Violet Cut filter, or others (i.e. the X-Rite
|
|
i1pro3) have measurement emulation modes, and this option allows the
|
|
instrument to be configured appropriately.<br>
|
|
<br>
|
|
<a name="A"></a>The <b>-A</b> options allows overriding the default
|
|
or environment variable set <a href="XRGA.html">XRGA</a>
|
|
conversion:<br>
|
|
<br>
|
|
<b>-A N|A|X|G</b><br>
|
|
<br>
|
|
The <b>N</b> argument sets
|
|
the calibration to Native (default).<br>
|
|
The <b>A</b> argument sets
|
|
the calibration to XRGA.<br>
|
|
The <b>X</b> argument sets
|
|
the calibration to XRDI.<br>
|
|
The <b>G</b> argument sets
|
|
the calibration to GMDI.<br>
|
|
<br>
|
|
<a name="N"></a> <span style="font-weight: bold;">-N</span> Any
|
|
instrument that requires regular calibration will ask for
|
|
calibration on initial start-up. Sometimes this can be awkward if
|
|
the instrument is being mounted in some sort of measuring jig, or
|
|
annoying if several sets of readings are being taken in quick
|
|
succession. The -<span style="font-weight: bold;">N</span>
|
|
suppresses this initial calibration if a valid and not timed out
|
|
previous calibration is recorded in the instrument or on the host
|
|
computer. It is advisable to only use this option on the second and
|
|
subsequent measurements in a single session.<br>
|
|
<br>
|
|
<a name="B"></a> <span style="font-weight: bold;">-B</span> Some
|
|
strip instruments (i.e.. Eye-One Pro, Color Munki) when used with
|
|
Argyll will automatically recognize a strip when read in the reverse
|
|
direction by matching the patch readings against their expected
|
|
values. If the expected values are not known accurately enough, this
|
|
may cause erroneous reverse recognition, so the <span
|
|
style="font-weight: bold;">-<span style="font-weight: bold;">B</span></span>
|
|
flag allows this to be turned off, forcing strips to only be read in
|
|
the forward direction. (Note that the DTP20 always allows
|
|
bi-directional strip reading.) If the randomized patch layout has
|
|
not been used, then bi-directional strip recognition will
|
|
automatically turned off, and a warning issued if the -B flag is not
|
|
used.<br>
|
|
<br>
|
|
<a name="b"></a><b>-b</b> By default chartread will disable
|
|
bi-directional strip reading if a randomized layout hasn't been
|
|
used. The <b>-b</b> flag forces bi-directional strip reading on
|
|
even for charts that don't use a randomized layout. If the chart
|
|
strips have a distinct patch order, then this will be reliable, but
|
|
for other patch layouts, the direction may be guessed wrongly, so
|
|
this option should be used with care.<br>
|
|
<br>
|
|
<a name="H"></a> The -<span style="font-weight: bold;">H</span>
|
|
option turns on high resolution spectral mode, if the instrument
|
|
supports it. See <a href="instruments.html">Operation of particular
|
|
instruments</a> for more details.<br>
|
|
<br>
|
|
<a name="X1"></a> The -<span style="font-weight: bold;">X <span
|
|
style="font-style: italic;">file.ccmx</span></span> option reads
|
|
a <a href="File_Formats.html#.ccmx">Colorimeter Correction Matrix</a>
|
|
from the given file, and applies it to the colorimeter instruments
|
|
readings. This can improve a colorimeters accuracy for a particular
|
|
type of display. A list of contributed <span style="font-weight:
|
|
bold;">ccmx</span> files is <a href="ccmxs.html">here</a>.<br>
|
|
<br>
|
|
<a name="X2"></a> The -<span style="font-weight: bold;">X <span
|
|
style="font-style: italic;">file.ccss</span></span> option reads
|
|
a <a href="File_Formats.html#.ccss">Colorimeter Calibration
|
|
Spectral Sample</a> from the given file, and uses it to set the
|
|
colorimeter instruments calibration. This will only work with
|
|
colorimeters that rely on sensor spectral sensitivity calibration
|
|
information (ie. the X-Rite <span style="font-weight: bold;">i1d3</span>,
|
|
or the DataColor <span style="font-weight: bold;">Spyder4 &
|
|
Spyder 5</span>).This can improve a colorimeters accuracy for a
|
|
particular type of display. A list of contributed <span
|
|
style="font-weight: bold;">ccss</span> files is <a
|
|
href="ccsss.html">here</a>.<br>
|
|
<br>
|
|
<a name="T"></a> The -<span style="font-weight: bold;">T ratio</span>
|
|
argument modifies the patch consistency tolerance threshold for some
|
|
strip reading instruments (ie. the Eye-One Pro). In recognizing
|
|
patches in a strip, an instrument may take multiple readings as the
|
|
strip is read, and then divide the readings up into each patch. It
|
|
may then check the consistency of the multiple readings
|
|
corresponding to each patch, and reject the measurement if they are
|
|
too inconsistent. For some media (ie. a coarser screens, fabric
|
|
etc.) the default tolerance may be unreasonably tight, so the <span
|
|
style="font-weight: bold;">-T ratio</span> argument can be used to
|
|
modify this criteria. To loosen the tolerance, use a number greater
|
|
than 1.0 (ie. 1.5, 2.0).<br>
|
|
<br>
|
|
<a name="Q"></a> The <b>-Q</b> flag allows specifying a tristimulus
|
|
observer for a colorimeter when using CCSS instrument calibration
|
|
capability. The following choices are available:<br>
|
|
<b> 1931_2</b> selects the standard CIE 1931 2 degree
|
|
observer. The default.<br>
|
|
<b>1964_10</b> selects the standard CIE 1964 10 degree
|
|
observer.<br>
|
|
<b> 2015_2</b> selects the standard CIE 2015 2 degree
|
|
observer.<br>
|
|
<b>2015_10</b> selects the standard CIE 2015 10 degree
|
|
observer.<br>
|
|
<b>1955_2</b> selects the Stiles and Birch 1955 2 degree
|
|
observer<br>
|
|
<b>1978_2 </b>selects the Judd and Voss 1978 2 degree
|
|
observer<br>
|
|
<b>shaw</b> selects the Shaw and Fairchild 1997 2 degree
|
|
observer<br>
|
|
<i><b>file.cmf</b></i> selects an observer specified by the
|
|
given <a href="File_Formats.html#.cmf">.cmf</a> file.<br>
|
|
<br>
|
|
<a name="S"></a>The <b>-S</b> flag causes the normal "wrong strip"
|
|
and "unexpected value" warnings to be suppressed. There may be a lot
|
|
of these warnings if the expected patch value in the .ti2 file is in
|
|
fact far from the values actually being measured. It is probably
|
|
advisable to also use the <span style="font-weight: bold;">-B</span>
|
|
flag if warnings are turned off, since many warnings indicate that
|
|
the expected values are not to be relied on. With warnings
|
|
suppressed, greater care must be taken to read the correct strip. If
|
|
the randomized patch layout has not been used, then "wrong strip"
|
|
warnings will automatically be suppressed, and bi-directional strip
|
|
recognition turned off.<br>
|
|
|
|
|
|
<br>
|
|
<a name="W"></a>The <b>-W</b> <span style="font-weight: bold;">n|h|x</span>
|
|
parameter overrides the default serial communications flow control
|
|
setting. The value <span style="font-weight: bold;">n</span> turns
|
|
all flow control off, <span style="font-weight: bold;">h</span>
|
|
sets hardware handshaking, and <span style="font-weight: bold;">x</span>
|
|
sets Xon/Xoff handshaking. This commend may be useful in workaround
|
|
serial communications issues with some systems and cables. <br>
|
|
<br>
|
|
<a name="D"></a>The <b>-D</b> flag causes communications and other
|
|
instrument diagnostics to be printed to stdout. A level can be set
|
|
between 1 .. 9, that may give progressively more verbose
|
|
information, depending on the instrument. This can be useful in
|
|
tracking down why an instrument can't connect.<br>
|
|
<br>
|
|
<a name="p1"></a> The <i>inoutfile</i> parameters should be the
|
|
base name of the .ti2 file, and chartread will output an .ti3 that
|
|
has the same basename and the .ti3 extension. If the incoming .ti2
|
|
file contains per-channel calibration curves, these will be passed
|
|
through to the .ti3 so that accurate ink limits can be computed
|
|
during profiling.<br>
|
|
<br>
|
|
<hr style="width: 50%; height: 2px;">
|
|
<h3>Discussion</h3>
|
|
For information about the operation of different instruments, see <a
|
|
href="instruments.html">Operation of particular instruments</a>.<br>
|
|
<br>
|
|
<br>
|
|
</body>
|
|
</html>
|