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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/</b><span style="text-decoration: underline;"></span>spec2cie</h2>
    <h3>Summary</h3>
    Convert spectral <a href="File_Formats.html#.ti3">.ti3</a>
    readings into CIE XYZ or L*a*b* readings. FWA compensation may be
    applied.<br>
    <h3>Usage</h3>
    <tt><small>spec2cie [options] <span style="font-style: italic;">input.ti3
          output.ti3<br>
          &nbsp;</span></small></tt><tt><small>-v
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        Verbose mode</small></tt><br>
    <tt><small><small>&nbsp;<a
            href="spec2cie.html#I">-I <i>illum</i></a>&nbsp;&nbsp;
          &nbsp;&nbsp; Override
          actual instrument illuminant
          in .ti3 file:<br>
          &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
          &nbsp;
          &nbsp;&nbsp; A, C, D50, D50M2, D65, F5,
          F8, F10 or file.sp<br>
          &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
          (only
          used in conjunction with <span style="font-weight: bold;">-f</span>)<br>
        </small></small></tt><tt><small><small>&nbsp;<a
            href="colprof.html#f">-f [<i>illum</i>]</a>
          &nbsp;&nbsp; Use Fluorescent Whitening Agent compensation
          [simulated inst. illum.:<br>
          &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>
        </small></small></tt><tt><small><small><small>&nbsp;<a
              href="spec2cie.html#i">-i <i>illum</i></a>&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;
            A, C, D50 (def.), D50M2, D65, F5,
            F8, F10 or file.sp<br>
            &nbsp;</small></small><a href="#o">-o
          <i>observ</i></a>&nbsp;
        &nbsp;&nbsp; Choose CIE Observer for spectral
        data:<br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;
&nbsp;&nbsp;
        1931_2 </small></tt><tt><small> (def.)</small></tt><tt><small>,
        1964_10, S&amp;B
        1955_2, shaw, J&amp;V 1978_2<br>
        &nbsp;<a href="#p">-n</a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Don't
output
        spectral values<br>
      </small></tt><tt><small>&nbsp;<a href="#p">-p</a>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        Plot
        each values spectrum</small></tt><tt><br>
    </tt><tt>
    </tt><tt><small>&nbsp;<span style="font-style: italic;">input.ti3</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Measurement
        file<br>
        &nbsp;<span style="font-style: italic;">output.ti3</span>&nbsp;&nbsp;&nbsp;&nbsp;
        Converted
        measurement file</small></tt><br>
    <h3>Comments</h3>
    This program takes the spectral data in a .ti3 file, converts them
    to
    XYZ and Lab and fills the XYZ_[XYZ] and LAB_[LAB] columns in the
    output
    .ti3 file with the computed XYZ and Lab values. If the columns
    XYZ_[XYZ] and/or LAB_[LAB] are missing in the input file, they are
    added to the output file.<br>
    <br>
    All other columns are copied from the input to the output .ti3 file.<br>
    <br>
    <br>
    <a name="I"></a>The <b>-I</b> parameter allows specifying a an
    illumination
    spectrum for the actual instrument illuminant, overriding that
    computed from
    the type of instrument (recorded in the .ti3 file). This is rarely
    used. This parameter is can
    only be used in combination with the <span style="font-weight:
      bold;">-f</span>
    flag. If a
    filename is specified instead, it will be assumed to be an Argyll
    specific <a href="File_Formats.html#.sp">.sp</a>
    custom spectrum file.
    Illuminant details are:<br>
    <br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; A&nbsp;&nbsp; CIE
    tungsten
    filament lamp 2848K<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D50 CIE daylight 5000K<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D65 CIE daylight 6500K<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; F5&nbsp; CIE Fluorescent
    6350K, CRI 72<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; F8&nbsp; CIE Fluorescent
    5000K, CRI 95<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; F10 CIE Fluorescent
    5000K,
    CRI 81<br>
    <br>
    <br>
    <a name="f"></a> 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. <br>
    <br>
    <a name="i"></a>The <b>-i</b> parameter allows specifying a
    standard or custom illumination spectrum, applied to spectral .ti3
    data to compute PCS (Profile Connection Space) 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>
    custom spectrum file. This only works if spectral data is available.
    Illuminant details are:<br>
    <br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; A&nbsp;&nbsp; CIE
    tungsten filament lamp 2848K<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D50 CIE daylight 5000K<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D65 CIE daylight 6500K<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; F5&nbsp; CIE Fluorescent
    6350K, CRI 72<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; F8&nbsp; CIE Fluorescent
    5000K, CRI 95<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; F10 CIE Fluorescent
    5000K, CRI 81<br>
    <br>
    Custom illuminants are most often used when a&nbsp; viewing booth or
    other known viewing conditions is going to be used to view results.
    Other illuminant reference files could be created using a suitable
    measuring instrument such as a spectrolino, or an eyeone using <a
      href="spotread.html">spotread</a>, although such instruments do
    not themselves provide the necessary response down to Ultra Violet
    that is needed for accurate operation of Fluorescent Whitening Agent
    compensation. The best way of measuring a custom illuminant is to
    use <a href="illumread.html">illumread</a>, since it uses a special
    method to estimate the illuminant UV in a way that complements FWA
    compensation. (See the discussion above for the <b>-f</b> flag).<br>
    <br>
    Note that if an illuminant other than D50 is chosen, the resulting
    ICC profile will not be standard, and may not work perfectly with
    other profiles that that use&nbsp; the standard ICC D50 illuminant,
    particularly if the absolute rendering intent is used. Profiles
    should generally be linked with other profiles that have the same
    illuminant and observer.<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>
    Note that if an observer other than 1931 2 degree is chosen, the
    resulting ICC profile will not be standard, and cannot be freely
    interchanged with other profiles that that us the standard 1931 2
    degree
    observer. Profiles should only be linked with other profiles that
    have
    the same illuminant and observer.<br>
    <br>
    <br>
    <br>
    <a name="n"></a>The <span style="font-weight: bold;">-n</span> flag
    disables the output of the spectral values. If just the XYZ and
    L*a*b*
    values are needed, this makes for a smaller, easier to read file.<br>
    <br>
    <a name="p"></a>The <span style="font-weight: bold;">-p</span> flag
    causes each spectrum to be plotted. If FWA compensation is used,
    then
    the before/after compensation spectrums will be shown.<br>
    <br>
    <br>
    <br>
    <br>
    <br>
    <br>
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