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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=windows-1252">
    <meta name="author" content="Graeme Gill">
  </head>
  <body>
    <h2><b>profile/profcheck</b></h2>
    <h3>Summary</h3>
    Check an&nbsp;<a href="File_Formats.html#ICC">ICC</a> profile
    against&nbsp;<a href="File_Formats.html#.ti3">.ti3</a> test chart
    data, and optionally create a pruned .ti3 file.<br>
    <h3>Usage Summary</h3>
    <small><span style="font-family: monospace;">profcheck&nbsp;
        [-options] data.ti3 iccprofile.icm</span><br style="font-family:
        monospace;">
      &nbsp; <span style="font-family: monospace;"></span></small><small><span
        style="font-family: monospace;">-v
        [level]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 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;">&nbsp;-c&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;
Show





        CIE94 delta E values</span><br style="font-family: monospace;">
      <span style="font-family: monospace;">&nbsp;-k
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        &nbsp;&nbsp; Show CIEDE2000 delta E values</span><br
        style="font-family: monospace;">
      <span style="font-family: monospace;">&nbsp;-w&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;
create





        X3DOM visualization (iccprofile.x3d.html)</span><br
        style="font-family: monospace;">
      <span style="font-family: monospace;">&nbsp;-x&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;
Use





        X3DOM axes<br>
        &nbsp;-m&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Make
X3DOM





        lines a minimum of 0.5<br style="font-family: monospace;">
      </span><span style="font-family: monospace;">&nbsp;-e&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Color
vectors





        acording to delta E<br>
        &nbsp;-s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        Sort output by delta E<br>
        &nbsp;-h&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;




        Plot a histogram of delta E's<br>
        &nbsp;-P
        de&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        Create a pruned .ti3 with points less or equal to de delta E<br
          style="font-family: monospace;">
      </span> <span style="font-family: monospace;">&nbsp;-d
        devval1,deval2,devvalN</span><br style="font-family: monospace;">
      <span style="font-family: monospace;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;
Specify





        a device value to sort against</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;
Sort





        device value by PCS/Lab target</span><br style="font-family:
        monospace;">
      &nbsp; <span style="font-family: monospace;">-f
        [illum]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Use Fluorescent Whitening
        Agent compensation [opt. simulated inst. illum.:<br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;





        M0, M1, M2, A, C, D50 (def.), D50M2, D65, F5, F8, F10 or
        file.sp]<br>
        &nbsp;-i illum&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Choose
        illuminant for computation of CIE XYZ from spectral data &amp;
        FWA:<br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;





        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;">&nbsp;-o
        observ&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; 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;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;





        1931_2 </span></small><small><span style="font-family:
        monospace;">(def.)</span></small><small><span
        style="font-family: monospace;">, 1964_10, S&amp;B 1955_2, shaw,
        J&amp;V 1978_2</span></small><small><span style="font-family:
        monospace;"><br>
        &nbsp;-I intent&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; r = relative
        colorimetric, a = absolute (default)<br style="font-family:
          monospace;">
      </span><i style="font-family: monospace;"> &nbsp;data.ti3</i><span
        style="font-family: monospace;">&nbsp;&nbsp;&nbsp;&nbsp;
        &nbsp;&nbsp; Test point data file</span><br style="font-family:
        monospace;">
      <i style="font-family: monospace;">&nbsp;iccprofile.icm</i><span
        style="font-family: monospace;">&nbsp; Profile to check</span></small>
    <br>
    <h3>Usage Details and Discussion</h3>
    <b> profcheck</b> provides a way of checking how well an&nbsp;<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.&nbsp; 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#X3DOM">X3DOM</a>
    3D visualization of the delta E's between the test points and the
    profiles prediction of the resulting colors.<br>
    <br>
    The <b>-x</b> flag adds Lab axes to the X3DOM 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 X3DOM output to be color coded according to
    their lengths, from longest to shortest: yellow, red, magenta, blue,
    cyan and green.<br>
    <br>
    The <b>-s</b> flag will cause the -v2 patch by patch delta E output
    to be sort from largest to smallest. This is useful in identifying
    badly read patches.<br>
    <br>
    The <b>-h</b> flag will display a histogram plot of the fit delta
    E's. The X scale is delta E, the Y scale is %<br>
    <br>
    The <b>-P N.NN</b> option will create a pruned .ti3 file called
    data_pN.NN that contains just the measurement points that have a fit
    delta E of less than or equal to the given delta E threshold. This
    can be useful if you know that there are faulty or poor accuracy
    readings in the data set. Use profcheck -h to examine the fit delta
    E histogram to choose a threshold that cuts off the tail, and then
    profcheck -P to create the pruned data set. You can check that this
    is appropriate if a profcheck -h on the resulting profile no longer
    has a long tail. <b>Note</b> that using this procedure will be of
    no benefit if the tail is due to an inherently poor fit of the
    profile to the data rather than reading innacuracy, even if it makes
    the fit appear to be better.<br>
    <br>
    <b>NOTE</b> that the pruning does not take any special care as to
    what test points are pruned - it may prune important points such as
    <b>white</b> and <b>black</b> points!<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.&nbsp; 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>&nbsp; 1931_2</b> selects the standard CIE 1931 2 degree
    observer. The default.<br>
    &nbsp; <b>1964_10</b> selects the standard CIE 1964 10 degree
    observer.<br>
    &nbsp; <b>1955_2</b> selects the Stiles and Birch 1955 2 degree
    observer<br>
    &nbsp; <b>1978_2 </b>selects the Judd and Voss 1978 2 degree
    observer<br>
    &nbsp; <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>