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<h2><b>profile/verify</b></h2>
<h3>Summary</h3>
Verify a color transform by comparing CIE measurement values from
two
test charts. The charts can be any suitably formatted CGATS or <a
href="File_Formats.html#.ti3">.ti3</a>
format that contains corresponding XYZ, Lab or spectral values. The
overall
average and worst case delta E will be reported, as well as the
worst
10% and best 90% of values.<br>
<h3>Usage Summary</h3>
<small><span style="font-family: monospace;">verify [-options]
target.ti3 measured.ti3</span><br style="font-family:
monospace;">
<span style="font-family: monospace;"> -v
Verbose - print each patch value<br>
-n
Normalise
each files reading to white Y<br>
-N
Normalise
each files reading to white XYZ<br>
-D
Use
D50 100.0 as L*a*b* white reference<br style="font-family:
monospace;">
</span><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;"> -s
Sort patch value by error</span><br
style="font-family: monospace;">
<span style="font-family: monospace;"> -w
create VRML vector visualisation (measured.wrl)<br>
</span></small><small><span style="font-family: monospace;"> -W
create VRML marker & vector visualisation
(measured.wrl)</span></small><br style="font-family: monospace;">
<small><span style="font-family: monospace;"></span><span
style="font-family: monospace;"> -x
Use VRML axes</span><br style="font-family: monospace;">
<span style="font-family: monospace;"> -i
illum Choose
illuminant for print/transparency spectral data:</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
A, C, D50 (def.), D65, F5, F8, F10 or
file.sp</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;"></span><br style="font-family:
monospace;">
<span style="font-family: monospace;"> -f
Use Fluorescent Whitening Agent
compensation</span><br style="font-family: monospace;">
<span style="font-family: monospace;"> </span><i
style="font-family: monospace;">target.ti3</i><span
style="font-family: monospace;">
Target
or reference patch data file</span><br style="font-family:
monospace;">
<span style="font-family: monospace;"> </span><i
style="font-family: monospace;">measured.ti3</i><span
style="font-family: monospace;"> Measured or
actual
patch
data file</span></small><br>
<h3>Usage Details and Discussion</h3>
<b> verify</b> provides a way of verifying how well a color
transformation (such a proofing) performs.<br>
<br>
The <b>-v</b> flag prints out extra information during the
checking,
and prints each patch value, rather than just a summary.<br>
<br>
The <b>-n</b> flag causes the two sets of values to be normalized
to
the Y value of white for each set before comparison. White is
assumed
to be the patch with the largest Y value.<br>
<br>
The <b>-N</b> flag causes the two sets of values to be normalized
to
the XYZ of white for each set before comparison. White is assumed to
be
the patch
with the largest Y value.<br>
<br>
The <b>-D</b> flag causes the white reference point for the
conversion
to L*a*b* to be D50 with a Y value of 100%. By default the sample
with
the largest Y value is found, and the L*a*b* white reference scaled
to
have that Y value. This allows sensible delta E values when
comparing
absolute color values, such as those from emission or display
measurements.<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>
If the <b>-s </b>flag is used in combination with the <b>-v</b>
flag,
then the test point by test point output will be sorted from worst
to
best.<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 in D50 L*a*b* space, each
difference being shown as a line vector. If the <span
style="font-weight: bold;">-W</span> flag is used, then the target
and
measured values will also be marked by a small sphere. This can be
used
to visualize the placement of values in a .ti3 (or other CGATS file)
by
using the same file for both "target" and "measured" values.<br>
<br>
The <b>-x</b> flag adds Lab axes to the VRML output.<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>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.<br>
<br>
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 <b>-f</b> flag enables Fluorescent Whitening Agent
compensation,
which compensates for the effect a different illuminant will have,
on
any Fluorescent Whitening Agent present in the reflective media.
Spectral patch information is needed for this to function.<br>
<br>
If both CIE and spectral values are present in the input files, the
CIE
values will be used by default. Using the <span style="font-weight:
bold;">-i</span>, <span style="font-weight: bold;">-o</span>
or <span style="font-weight: bold;">-f</span> flag will force
spectral
values to be used. The the <span style="font-weight: bold;">-i</span>,
<span style="font-weight: bold;">-o</span> or <span
style="font-weight: bold;">-f</span> flags will apply to both the
target and measured input files.<br>
<br>
<br>
<br>
<br>
<br>
<br>
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