167 lines
5.8 KiB
HTML
Executable File
167 lines
5.8 KiB
HTML
Executable File
<!DOCTYPE html PUBLIC "-//w3c//dtd html 4.0 transitional//en">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html;
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charset=windows-1252">
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<meta http-equiv="content-type" content="text/html;
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charset=windows-1252">
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<meta name="GENERATOR" content="Mozilla/4.73 [en] (WinNT; I)
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[Netscape]">
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<title>Argyll XRGA conversion</title>
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</head>
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<body>
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<br>
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<h2> <u>Conversion to/from XRGA<br>
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</u></h2>
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After purchasing Gretag-Macbeth, X-Rite harmonized the subtly
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different calibration standards the two companies were using for
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their reflective measurement instruments, in order to minimize
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changes with the introduction of new instruments. The result was the
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<a href="http://www.xrite.com/xrite-graphic-arts-standard">XRGA
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standard</a>, introduced in September 2010.<br>
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<br>
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Current X-Rite instruments are natively calibrated to XRGA, while
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older instruments from X-Rite are calibrated to XRDI, and
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Gretag-Macbeth instruments to GMDI standards. To smooth the
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interchange of old and new instruments, a spectral <a
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href="https://www.xrite.com/documents/literature/en/L7-462_XRGA_WhitePaper_en.pdf">conversion
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is possible</a> between these different standards. While such a
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conversion is not perfect, it reduces the discontinuities between
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old instrument families and current X-Rite instruments.<br>
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<br>
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By default, Argyll will use the native calibration of Gretag-Macbeth
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and X-Rite instruments. These are summarized here:<br>
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<br>
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<table cellspacing="2" cellpadding="2" border="0">
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<tbody>
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<tr>
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<td valign="top"><a href="instruments.html#DTP20">DTP20
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"Pulse"</a> <br>
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</td>
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<td valign="top">XRDI<br>
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</td>
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</tr>
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<tr>
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<td valign="top"><a href="instruments.html#DTP22">DTP22
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Digital Swatchbook</a></td>
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<td valign="top">XRDI<br>
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</td>
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</tr>
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<tr>
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<td valign="top"><a href="instruments.html#DTP41">DTP41</a></td>
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<td valign="top">XRDI<br>
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</td>
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</tr>
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<tr>
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<td valign="top"><a href="instruments.html#dtp51">DTP51</a></td>
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<td valign="top">XRDI<br>
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</td>
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</tr>
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<tr>
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<td valign="top"> <a href="instruments.html#sl">Spectrolino</a>/
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<a href="instruments.html#ss">SpectroScan</a></td>
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<td valign="top">GMDI<br>
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</td>
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</tr>
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<tr>
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<td valign="top"><a href="instruments.html#i1p">Eye-One Pro</a>
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Rev A-D</td>
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<td valign="top">GMDI<br>
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</td>
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</tr>
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<tr>
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<td valign="top"><a href="instruments.html#ColorMunki"><span
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style="text-decoration: underline;">ColorMunki</span></a>
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Design, Photo or i1Studio<br>
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</td>
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<td valign="top">XRGA<br>
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</td>
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</tr>
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<tr>
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<td valign="top"><a href="instruments.html#i1p2">Eye-One Pro2</a>
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(Eye-One Pro Rev E)</td>
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<td valign="top">XRGA<br>
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</td>
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</tr>
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<tr>
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<td valign="top"><a href="instruments.html#i1p3">Eye-One Pro 3</a><br>
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</td>
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<td valign="top">XRGA<br>
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</td>
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</tr>
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</tbody>
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</table>
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<br>
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<br>
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You can override this and force reflective data to be a particular
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calibration standard in two ways:<br>
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<br>
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<a name="A"></a>Using the <b>-A</b> command line option in <a
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href="spotread.html#A">spotread</a> and <a
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href="chartread.html#A">chartread</a>:<br>
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<br>
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<b>-A </b>N|A|X|G<br>
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<br>
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The <b>N</b> argument sets
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the calibration to Native.<br>
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The <b>A</b> argument sets
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the calibration to XRGA.<br>
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The <b>X</b> argument sets
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the calibration to XRDI.<br>
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The <b>G</b> argument sets
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the calibration to GMDI.<br>
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<br>
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<br>
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Or by setting an environment variable:<br>
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(Note that command line options will override this.)<br>
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<br>
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<br>
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<span style="font-weight: bold;"><a name="ARGYLL_XRGA"></a>ARGYLL_XRGA</span><br>
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<br>
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<div style="margin-left: 40px;"> If the <span style="font-weight:
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bold;">ARGYLL_XRGA </span> environment variable is set to:<br>
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<br>
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<b>XRGA</b>, then all Getag-MacBeth/X-Rite
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reflective measurements will be converted to XRGA.<br>
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<b> XRDI</b>, then all Getag-MacBeth/X-Rite
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reflective measurements will be converted to XRDI.<br>
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<b> GMDI</b>, then all Getag-MacBeth/X-Rite
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reflective measurements will be converted to GMDI.<br>
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<br>
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If not set (or set to some other string), then the native
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calibration will be used. Note that the values must be upper case.<br>
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</div>
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<span style="font-weight: bold;"></span><br>
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All of the above except the <b>DTP51</b> can have a conversion
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applied. <br>
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(The DTP51 returns only colorimetric data, while the conversion
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requires spectral data.)<br>
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<br>
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You can also convert from one standard to the other using <a
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href="spec2cie.html#A">spec2cie</a>.<br>
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<br>
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For informational purposes, the native calibration of some other
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Gretag-Macbeth and X-Rite instruments are:<br>
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<br>
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<table cellspacing="2" cellpadding="2" border="0">
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<tbody>
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<tr>
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<td valign="top">HP Z printer Sensor <br>
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</td>
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<td valign="top">GMDI<br>
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</td>
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</tr>
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</tbody>
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</table>
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<br>
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<br>
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<br>
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</body>
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</html>
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