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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>profcheck</title>
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
<meta name="author" content="Graeme Gill">
</head>
<body>
<h2><b>profile/profcheck</b></h2>
<h3>Summary</h3>
Check an <a href="File_Formats.html#ICC">ICC</a> profile
against <a href="File_Formats.html#.ti3">.ti3</a> test chart
data.<br>
<h3>Usage Summary</h3>
<small><span style="font-family: monospace;">profcheck
[-options]
data.ti3 iccprofile.icm</span><br style="font-family:
monospace;">
<span style="font-family: monospace;"></span></small><small><span
style="font-family: monospace;">-v
[level]
Verbosity level (default 1), 2 to print each DE</span></small><small><span
style="font-family: monospace;"></span><br style="font-family:
monospace;">
<span style="font-family: monospace;"> -c
Show
CIE94 delta E values</span><br style="font-family: monospace;">
<span style="font-family: monospace;"> -k
Show CIEDE2000 delta E values</span><br
style="font-family: monospace;">
<span style="font-family: monospace;"> -w
create
VRML visualization (iccprofile.wrl)</span><br
style="font-family: monospace;">
<span style="font-family: monospace;"> -x
Use
VRML axes<br>
-m
Make
VRML
lines a minimum of 0.5<br style="font-family: monospace;">
</span><span style="font-family: monospace;"> -e
Color
vectors
acording to delta E</span><br style="font-family: monospace;">
<span style="font-family: monospace;"> -d
devval1,deval2,devvalN</span><br style="font-family: monospace;">
<span style="font-family: monospace;">
Specify
a device value to sort
against</span><br style="font-family: monospace;">
<span style="font-family: monospace;"> -p
Sort
device value by PCS/Lab target</span><br style="font-family:
monospace;">
<span style="font-family: monospace;">-f
[illum] Use Fluorescent Whitening
Agent compensation [opt. simulated inst. illum.:<br>
M0, M1, M2, A, C, D50 (def.), D50M2, D65, F5, F8, F10 or
file.sp]<br>
-i illum Choose
illuminant for computation of CIE XYZ from spectral data &
FWA:<br>
A, C, D50 (def.), D50M2, D65, F5, F8, F10 or file.sp</span><span
style="font-family: monospace;"></span><br style="font-family:
monospace;">
<span style="font-family: monospace;"> -o
observ
Choose CIE
Observer
for spectral data:</span><br style="font-family: monospace;">
<span style="font-family: monospace;"></span></small><small><span
style="font-family: monospace;">
1931_2
</span></small><small><span style="font-family: monospace;">(def.)</span></small><small><span
style="font-family: monospace;">,
1964_10, S&B
1955_2, shaw, J&V 1978_2</span></small><small><span
style="font-family: monospace;"><br>
-I intent r = relative
colorimetric, a = absolute (default)<br style="font-family:
monospace;">
</span><i style="font-family: monospace;"> data.ti3</i><span
style="font-family: monospace;">
Test
point data file</span><br style="font-family: monospace;">
<i style="font-family: monospace;"> iccprofile.icm</i><span
style="font-family: monospace;"> Profile to check</span></small>
<br>
<h3>Usage Details and Discussion</h3>
<b> profcheck</b> provides a way of checking how well an <a
href="File_Formats.html#ICC">ICC</a> profile conforms to the test
sample data that was used to create it (or other test samples
that are from the same device). This is the same sort of check done
within
the profile making tool (<a href="colprof.html">colprof</a>), but
having a
separate tool provides some flexibility. The absolute forward
table in the profile is used to create PCS values from the sample
points, and the profiles PCS value then compared to the PCS values
of
the measured sample points. Note the lower delta E values are not
always a better measure of how good a profile is. The aim of a
profile
is to model the underlying characteristics of a device, not to
slavishly reproduce the sampled data point values. Sampled data
point
values contain device variation and instrument reading inaccuracies,
and a good profiler will try and filter out this noise, resulting in
some deliberate differences between the profile and the sample
points
used to create it.<br>
<br>
The <b>-v</b> flag prints out extra information during the
checking. A
value greater than 1 will print the color values of each test point.<br>
<br>
The <b>-c</b> option causes the differences between the test values
and
the profile prediction of the color for each device value to be
displayed
in CIE94 delta E, rather than plain L*a*b* delta E. CIE94 delta E
has a
closer
correspondence with perceived color differences than the default
CIE76
delta E values.<br>
<br>
The <b>-k</b> option causes the differences between the test values
and
the profile prediction of the color for each device value to be
displayed
in CIEDE2000 delta E, rather than plain L*a*b* delta E. CIEDE2000
delta
E has a
closer
correspondence with perceived color differences than either CIE76 or
CIE94 delta E values.<br>
<br>
The <b>-w</b> creates a <a href="File_Formats.html#VRML">VRML</a>
3D
visualization
of the differences between the test points and the profiles
prediction
of
the resulting colors.<br>
<br>
The <b>-x</b> flag adds Lab axes to the VRML output.<br>
<br>
The <b>-m</b> flag makes each error line a minimum of 0.5 delta E
long, so that all the points are visible. This makes it easier to
view
the distribution of test points in the reference set.<br>
<br>
The <span style="font-weight: bold;">-e</span> flag causes the
error
vectors in the VRML output to be color coded according to their
lengths, from longest to shortest: yellow, red, magenta, blue, cyan
and
green.<br>
<br>
The <b>-d</b> parameters allow the specification of a particular
device value,
and the test point by test point output will be sorted by distance
from
the
given device value. This can be useful in determining how well
"supported"
the profile is in a particular area of the colorspace.<br>
<br>
If the <b>-p </b>flag is used in combination with the <b>-d</b>
parameters,
then the test point by test point output will be sorted by distance
in
PCS
(Lab) space rather than distance in device space.<br>
<br>
The <b>-f</b> flag enables Fluorescent Whitening Agent (FWA)
compensation. This only works if spectral data is available and, the
instrument is not UV filtered. FWA compensation adjusts the
spectral samples so that they appear to have been measured using an
illuminant that has a different level of Ultra Violet to the one the
instrument actually used in the measurement. The optional
illumination parameter allows specifying a standard or custom
illumination spectrum to be used as the similated instrument
illuminant, overriding the default <b>D50</b> or CIE computation
illuminant used for FWA (see <b>-i</b> below<b>). </b>See <a
href="colprof.html#f">colprof -f</a> for
a fuller explanation. The same value should be used as was used
during the creation of the
profile.<br>
<br>
The <b>-i</b> flag allows specifying a standard or custom
illumination
spectrum, applied to the spectral test point values to compute CIE
tristimulus values. <b>A</b>, <b>D50</b>, <b>D50M2, D65</b>, <b>F5</b>,
<b>F8</b>, <b>F10</b> are a selection of standard illuminant
spectrums, with <b>D50</b> being the default. If a filename is
specified instead, it will be assumed to be an Argyll specific <a
href="File_Formats.html#.sp">.sp</a>
spectrum file. If FWA compensation is used during measurement, this
illuminant will be used by default as the simulated instrument
illuminant. The same value should be used as was used during the
creation of the
profile.<br>
<br>
<a name="o"></a> The <b>-o</b> flag allows specifying a tristimulus
observer, and is used to compute PCS (Profile Connection Space)
tristimulus values. 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>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>
<br>
The same parameter value should be used as was used during the
creation
of the profile.<br>
<br>
The <span style="font-weight: bold;">-I</span> parameter allows
changing the intent used in looking up the ICC profile colors to
relative colorimetric. This would <span style="text-decoration:
underline;">not</span> be used if you are
checking a profile against the .ti3 file that was used to create it,
since, since profiles are always made
from absolute colorimetric measurement values.<br>
<br>
<br>
<br>
<br>
<br>
</body>
</html>
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