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diff --git a/doc/synthread.html b/doc/synthread.html new file mode 100644 index 0000000..116a43d --- /dev/null +++ b/doc/synthread.html @@ -0,0 +1,166 @@ +<!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;"> -v + 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;"> -p +Use separation profile</span><br style="font-family: monospace;"> +<span style="font-family: monospace;"> -l +Output Lab rather than XYZ<br> +<br style="font-family: monospace;"> +</span><span style="font-family: monospace;"> -0 +pow +Apply power to input device chanel 0-9 (after sep.)<br> +<br style="font-family: monospace;"> +</span><span style="font-family: monospace;"> -r +level +Add average random deviation of <level>% to input device values +(after sep.)</span><br style="font-family: monospace;"> +<span style="font-family: monospace;"> -R +level +Add average random deviation of <level>% to output PCS values<br> +</span></small><small><span style="font-family: monospace;"> -u + + +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;"> -b +L,a,b +Scale black point to target Lab value</span><br + style="font-family: monospace;"> +<span style="font-family: monospace;"> [<span + style="font-style: italic;">separation.icm</span>] +Device link separation profile</span><br style="font-family: monospace;"> +<span style="font-family: monospace;"> </span><i + style="font-family: monospace;">profile.</i><span + style="font-family: monospace;">[icm|mpp|ti3] </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 </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;"> + +<span style="font-family: monospace;"></span><i + style="font-family: monospace;">inoutfile</i><span + style="font-family: monospace;"> + 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 -> CMYK, +or perhaps CMYK->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> |