From 3db384424bd7398ffbb7a355cab8f15f3add009f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= Date: Sun, 2 Oct 2016 19:24:58 +0200 Subject: New upstream version 1.9.1+repack --- doc/XRGA.html | 137 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 137 insertions(+) create mode 100644 doc/XRGA.html (limited to 'doc/XRGA.html') 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 @@ + + + + + + + Argyll XRGA conversion + + +
+

Conversion to/from XRGA
+

+ 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 + XRGA + standard, introduced in September 2010.
+
+ 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 conversion + + + is possible between these different standards. While such a + conversion is not perfect, it reduces the discontinuities between + old instrument families and current X-Rite instruments.
+
+ By default, Argyll will use the native calibration of Gretag-Macbeth + and X-Rite instruments. These are summarized here:
+
+  
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
DTP20 + "Pulse" 
+ 		XRDI
+
DTP22 + Digital SwatchbookXRDI
+
DTP41XRDI
+
DTP51XRDI
+
Spectrolino/ + SpectroScanGMDI
+
Eye-One Pro + Rev A-DGMDI
+
ColorMunki + Design or PhotoXRGA
+
Eye-One Pro2 + (Eye-One Pro Rev E)XRGA
+
+
+
+ You can override this and force reflective data to be a particular + calibration standard in two ways:
+
+ Using the -A command line option in spotread and chartread:
+
+     -A N|A|X|G
+
+         The N argument sets + the calibration to Native.
+         The A argument sets + the calibration to XRGA.
+         The X argument sets + the calibration to XRDI.
+         The G argument sets + the calibration to GMDI.
+
+
+ Or by setting an environment variable:
+ (Note that command line options will override this.)
+
+
+ ARGYLL_XRGA
+
+
If the ARGYLL_XRGA  environment variable is set to:
+
+     XRGA, then all Getag-MacBeth/X-Rite + reflective measurements will be converted to XRGA.
+     XRDI, then all Getag-MacBeth/X-Rite + reflective measurements will be converted to XRDI.
+     GMDI, then all Getag-MacBeth/X-Rite + reflective measurements will be converted to GMDI.
+
+ If not set (or set to some other string), then the native + calibration will be used. Note that the values must be upper case.
+
+
+ All of the above except the DTP51 can have a conversion + applied.
+ (The DTP51 returns only colorimetric data, while the conversion + requires spectral data.)
+
+ + -- cgit v1.2.3