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diff --git a/doc/XRGA.html b/doc/XRGA.html new file mode 100644 index 0000000..295d7b2 --- /dev/null +++ b/doc/XRGA.html @@ -0,0 +1,137 @@ +<!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> + <br> + <table border="0" cellpadding="2" cellspacing="2"> + <tbody> + <tr> + <td valign="top"><a href="instruments.html#DTP20">DTP20 + "Pulse"</a> <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> + <b>-A </b>N|A|X|G<br> + <br> + The <b>N</b> argument sets + the calibration to Native.<br> + The <b>A</b> argument sets + the calibration to XRGA.<br> + The <b>X</b> argument sets + the calibration to XRDI.<br> + 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 </span> environment variable is set to:<br> + <br> + <b>XRGA</b>, then all Getag-MacBeth/X-Rite + reflective measurements will be converted to XRGA.<br> + <b> XRDI</b>, then all Getag-MacBeth/X-Rite + reflective measurements will be converted to XRDI.<br> + <b> 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> |