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authorJörg Frings-Fürst <debian@jff-webhosting.net>2016-10-02 19:25:17 +0200
committerJörg Frings-Fürst <debian@jff-webhosting.net>2016-10-02 19:25:17 +0200
commitc2ca7be5a751879159f3cb591a64bb9568b79762 (patch)
tree04e38d4f4a2aad4d789bda0a65b7abb80a3439a2 /doc/XRGA.html
parent45c152c326d87478fbf41714b4b8e2f7b57a282b (diff)
parent3db384424bd7398ffbb7a355cab8f15f3add009f (diff)
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+<!DOCTYPE html PUBLIC "-//w3c//dtd html 4.0 transitional//en">
+<html>
+ <head>
+ <meta http-equiv="Content-Type" content="text/html;
+ charset=windows-1252">
+ <meta http-equiv="content-type" content="text/html;
+ charset=windows-1252">
+ <meta name="GENERATOR" content="Mozilla/4.73 [en] (WinNT; I)
+ [Netscape]">
+ <title>Argyll XRGA conversion</title>
+ </head>
+ <body>
+ <br>
+ <h2> <u>Conversion to/from XRGA<br>
+ </u></h2>
+ After purchasing Gretag-Macbeth, X-Rite harmonized the subtly
+ different calibration standards the two companies were using for
+ their reflective measurement instruments, in order to minimize
+ changes with the introduction of new instruments. The result was the
+ <a href="http://www.xrite.com/xrite-graphic-arts-standard">XRGA
+ standard</a>, introduced in September 2010.<br>
+ <br>
+ Current X-Rite instruments are natively calibrated to XRGA, while
+ older instruments from X-Rite are calibrated to XRDI, and
+ Gretag-Macbeth instruments to GMDI standards. To smooth the
+ interchange of old and new instruments, a spectral <a
+href="https://www.xrite.com/documents/literature/en/L7-462_XRGA_WhitePaper_en.pdf">conversion
+
+
+ is possible</a> between these different standards. While such a
+ conversion is not perfect, it reduces the discontinuities between
+ old instrument families and current X-Rite instruments.<br>
+ <br>
+ By default, Argyll will use the native calibration of Gretag-Macbeth
+ and X-Rite instruments. These are summarized here:<br>
+ <br>
+ &nbsp; <br>
+ <table border="0" cellpadding="2" cellspacing="2">
+ <tbody>
+ <tr>
+ <td valign="top"><a href="instruments.html#DTP20">DTP20
+ "Pulse"</a>&nbsp; <br>
+ </td>
+ <td valign="top">XRDI<br>
+ </td>
+ </tr>
+ <tr>
+ <td valign="top"><a href="instruments.html#DTP22">DTP22
+ Digital Swatchbook</a></td>
+ <td valign="top">XRDI<br>
+ </td>
+ </tr>
+ <tr>
+ <td valign="top"><a href="instruments.html#DTP41">DTP41</a></td>
+ <td valign="top">XRDI<br>
+ </td>
+ </tr>
+ <tr>
+ <td valign="top"><a href="instruments.html#dtp51">DTP51</a></td>
+ <td valign="top">XRDI<br>
+ </td>
+ </tr>
+ <tr>
+ <td valign="top"> <a href="instruments.html#sl">Spectrolino</a>/
+ <a href="instruments.html#ss">SpectroScan</a></td>
+ <td valign="top">GMDI<br>
+ </td>
+ </tr>
+ <tr>
+ <td valign="top"><a href="instruments.html#i1p">Eye-One Pro</a>
+ Rev A-D</td>
+ <td valign="top">GMDI<br>
+ </td>
+ </tr>
+ <tr>
+ <td valign="top"><a href="instruments.html#ColorMunki"><span
+ style="text-decoration: underline;">ColorMunki</span></a>
+ Design or Photo</td>
+ <td valign="top">XRGA<br>
+ </td>
+ </tr>
+ <tr>
+ <td valign="top"><a href="instruments.html#i1p2">Eye-One Pro2</a>
+ (Eye-One Pro Rev E)</td>
+ <td valign="top">XRGA<br>
+ </td>
+ </tr>
+ </tbody>
+ </table>
+ <br>
+ <br>
+ You can override this and force reflective data to be a particular
+ calibration standard in two ways:<br>
+ <br>
+ <a name="A"></a>Using the <b>-A</b> command line option in <a
+ href="spotread.html#A">spotread</a> and <a
+ href="chartread.html#A">chartread</a>:<br>
+ <br>
+ &nbsp;&nbsp;&nbsp; <b>-A </b>N|A|X|G<br>
+ <br>
+ &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; The <b>N</b> argument sets
+ the calibration to Native.<br>
+ &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; The <b>A</b> argument sets
+ the calibration to XRGA.<br>
+ &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; The <b>X</b> argument sets
+ the calibration to XRDI.<br>
+ &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; The <b>G</b> argument sets
+ the calibration to GMDI.<br>
+ <br>
+ <br>
+ Or by setting an environment variable:<br>
+ (Note that command line options will override this.)<br>
+ <br>
+ <br>
+ <span style="font-weight: bold;"><a name="ARGYLL_XRGA"></a>ARGYLL_XRGA</span><br>
+ <br>
+ <div style="margin-left: 40px;"> If the <span style="font-weight:
+ bold;">ARGYLL_XRGA&nbsp;</span> environment variable is set to:<br>
+ <br>
+ &nbsp;&nbsp;&nbsp; <b>XRGA</b>, then all Getag-MacBeth/X-Rite
+ reflective measurements will be converted to XRGA.<br>
+ <b>&nbsp;&nbsp;&nbsp; XRDI</b>, then all Getag-MacBeth/X-Rite
+ reflective measurements will be converted to XRDI.<br>
+ <b>&nbsp;&nbsp;&nbsp; GMDI</b>, then all Getag-MacBeth/X-Rite
+ reflective measurements will be converted to GMDI.<br>
+ <br>
+ If not set (or set to some other string), then the native
+ calibration will be used. Note that the values must be upper case.<br>
+ </div>
+ <span style="font-weight: bold;"></span><br>
+ All of the above except the <b>DTP51</b> can have a conversion
+ applied. <br>
+ (The DTP51 returns only colorimetric data, while the conversion
+ requires spectral data.)<br>
+ <br>
+ </body>
+</html>