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authorJörg Frings-Fürst <debian@jff-webhosting.net>2014-09-01 13:56:46 +0200
committerJörg Frings-Fürst <debian@jff-webhosting.net>2014-09-01 13:56:46 +0200
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
+<html>
+<head>
+ <title>fakeread</title>
+ <meta http-equiv="content-type"
+ content="text/html; charset=ISO-8859-1">
+ <meta name="author" content="Graeme Gill">
+</head>
+<body>
+<h2><b>spectro/synthread</b></h2>
+<h3>Summary</h3>
+Simulate the measurement of a devices response using a synthetic device
+model. This is intended for testing of profile creation accuracy. A
+device link
+separation or color space conversion can be applied before the
+print/measure simulation.<br>
+<h3>Usage</h3>
+<small><span style="font-family: monospace;">synthread [-v] </span></small><small><span
+ style="font-family: monospace;">[<span style="font-style: italic;">separation.ic<span
+ style="font-family: monospace;">m</span></span>]</span></small><small><span
+ style="font-family: monospace;"></span><span
+ style="font-family: monospace;"> </span><i
+ style="font-family: monospace;">inoutfile</i><br
+ style="font-family: monospace;">
+<span style="font-family: monospace;">&nbsp;-v&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+&nbsp; &nbsp; &nbsp; &nbsp; Verbose mode</span><span
+ style="font-family: monospace;"></span><span
+ style="font-family: monospace;"></span><br
+ style="font-family: monospace;">
+<span style="font-family: monospace;">&nbsp;-p&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+Use separation profile</span><br style="font-family: monospace;">
+<span style="font-family: monospace;">&nbsp;-l&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+Output Lab rather than XYZ<br>
+<br style="font-family: monospace;">
+</span><span style="font-family: monospace;">&nbsp;-0
+pow&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+Apply power to input device chanel 0-9 (after sep.)<br>
+<br style="font-family: monospace;">
+</span><span style="font-family: monospace;">&nbsp;-r
+level&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+Add average random deviation of &lt;level&gt;% to input device values
+(after sep.)</span><br style="font-family: monospace;">
+<span style="font-family: monospace;">&nbsp;-R
+level&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+Add average random deviation of &lt;level&gt;% to output PCS values<br>
+</span></small><small><span style="font-family: monospace;">&nbsp;-u
+&nbsp; &nbsp; &nbsp;
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+Make random deviations have uniform distributions rather than normal</span></small><br
+ style="font-family: monospace;">
+<small><span style="font-family: monospace;"></span><span
+ style="font-family: monospace;">&nbsp;-b
+L,a,b&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+Scale black point to target Lab value</span><br
+ style="font-family: monospace;">
+<span style="font-family: monospace;">&nbsp;[<span
+ style="font-style: italic;">separation.icm</span>]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+Device link separation profile</span><br style="font-family: monospace;">
+<span style="font-family: monospace;">&nbsp;</span><i
+ style="font-family: monospace;">profile.</i><span
+ style="font-family: monospace;">[icm|mpp|ti3] &nbsp; &nbsp; </span><a
+ style="font-family: monospace;" href="File_Formats.html#ICC">ICC</a><span
+ style="font-family: monospace;">, </span><a
+ style="font-family: monospace;" href="File_Formats.html#MPP">MPP</a><span
+ style="font-family: monospace;">
+or&nbsp;</span><a style="font-family: monospace;"
+ href="File_Formats.html#.ti3">.ti3</a><span
+ style="font-family: monospace;">
+profile/file to use</span><br style="font-family: monospace;">
+&nbsp;
+<span style="font-family: monospace;"></span><i
+ style="font-family: monospace;">inoutfile</i><span
+ style="font-family: monospace;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+&nbsp; &nbsp; &nbsp; &nbsp; Base name for
+input[</span><a style="font-family: monospace;"
+ href="File_Formats.html#.ti1">.ti1</a><span
+ style="font-family: monospace;">]/output[</span><a
+ style="font-family: monospace;" href="File_Formats.html#.ti3">.ti3</a><span
+ style="font-family: monospace;">] file</span></small><br>
+<b><br>
+Examples</b><br>
+<br>
+synthread xxxx testvalues<br>
+synthread -p xxx separation.icm testvalues<br>
+<h3>Comments<br>
+</h3>
+The <span style="font-weight: bold;">-v</span> flag does nothing at
+the moment.<br>
+The <span style="font-weight: bold;">-p</span> flag enables a device
+to device value conversion before
+converting to expected PCS values.<br>
+The <span style="font-weight: bold;">-l</span> flag causes the CIE
+output values to be L*a*b* rather than the
+default XYZ values.<br>
+<br>
+The <span style="font-weight: bold;">-0, -1, -2 .. -9</span>
+parameters are a way of simulating changes in the
+behaviour of the simulated printing system. The parameter supplied to
+the flag will be used to modify the device values (after any separation
+is applied) by raising them to the power of the parameter. This applies
+a transfer curve to the simulated device response.<br>
+<br>
+The <span style="font-weight: bold;">-r</span> parameter is a way of
+simulating instability in the behaviour of
+the simulated
+printing system. The parameter supplied to the flag will be used to
+scale a random offset added to the device values (after any separation
+is applied). The offset will be a normally distributed error with an
+average deviation of level%. A typically value supplied
+might be 1.0 to simulate 1% randomness.<br>
+<br>
+The <span style="font-weight: bold;">-R</span> parameter is a way of
+simulating instability in the behaviour of
+the simulated
+measuring system. The parameter supplied to the flag will be used to
+scale a random offset added to the PCS values. The offset will be a
+normally distributed error with an average deviation of level%. A
+typically value supplied
+might be 1.0 to simulate 1% randomness. <br>
+<br>
+The <span style="font-weight: bold;">-u</span> flag changes the
+distribution of the random offsets applied using the <span
+ style="font-weight: bold;">-r</span> or <span
+ style="font-weight: bold;">-R</span> flags, from the default standard
+deviation, to a uniform deviation distribution. The level is still
+specified as an average deviation.<br>
+<br>
+The <span style="font-weight: bold;">-b</span> parameter is a way of
+simulating devices that have a different black point to the profile
+used. This only works if an ICC profile is used, and scales the black
+point to the parameter value. This will be done in XYZ space by
+default, and in L*a*b* space if the <span style="font-weight: bold;">-l</span>
+flag is used.<br>
+<br>
+synthread is useful in creating artificial test value for testing <a
+ href="colprof.html">colprof</a>, as well as providing one path for
+turning an MPP profile into an ICC profile. If a <a
+ href="File_Formats.html#.ti3">.ti3</a> file is
+specified instead of an <a href="File_Formats.html#ICC">ICC</a> or <a
+ href="File_Formats.html#MPP">MPP</a> profile,
+then the closest matching measured points in the .<a
+ href="File_Formats.html#.ti3">.ti3</a> are substituted
+for the test values in the <a href="File_Formats.html#.ti1">.ti1</a>
+file on
+output. If the <a href="File_Formats.html#.ti1">.ti1</a>
+file is a monochrome test file with a White device value, then an RGB <a
+ href="File_Formats.html#ICC">ICC</a> profile, <a
+ href="File_Formats.html#MPP">MPP</a> or <a
+ href="File_Formats.html#.ti3">.ti3</a> may be used, and the White
+values will be translated to equal RGB values. If the <a
+ href="File_Formats.html#.ti1">.ti1</a>
+file is a monochrome test file with a Black device value, then a CMYK <a
+ href="File_Formats.html#ICC">ICC</a> profile, <a
+ href="File_Formats.html#MPP">MPP</a> or <a
+ href="File_Formats.html#.ti3">.ti3</a> may be used, and the Black
+values will be translated to equal CMY = 0, K = grey values. <br>
+<br>
+If a separation device profile is provided (e.g. from CMY -&gt; CMYK,
+or perhaps CMYK-&gt;CMYK, to simulate a color correction step before
+"printing"), then this will be applied to the .ti1 device values,
+before converting the the device values into .ti3 PCS values.<br>
+<br>
+<br>
+<br>
+</body>
+</html>