Hi, > what is the purpouse of the chrm - chromaticityType encoding tag?
That is a pre-v4 tag; (from spec) "The chromaticity tag type provides basic chromaticity data and type of phosphors or colorants of a monitor to applications and utilities". 9.2.12 chromaticityTag Tag signature: 'chrm' (6368726Dh) Allowed tag type: chromaticity type The data and type of phosphor/colorant chromaticity set. Byte position Field Length (bytes) Content Encoded as. 0..3 4 'chrm' (6368726Dh) type signature 4..7 4 reserved, must be set to 0 8..9 2 Number of Device Channels (n) uInt16Number 10..11 2 encoded value of phosphor or colorant type see Table 24 12..19 8 CIE xy coordinate values of channel 1 u16Fixed16Number[2] 20..end (n-1) x 8 CIE xy coordinate values of other n channels (if needed) u16Fixed16Number[...] The [r,g,b,k]XYZ tags holds values after chromatic adaptation, and those are raw primaries. Now all this stuff is superseded by chromatic adaptation tag. Anyway this tag is merely informative, and not used by lcms anymore. Regards, Marti Maria The little cms project http://www.littlecms.com ----- Original Message ----- From: "Kai-Uwe Behrmann" <[EMAIL PROTECTED]> To: "Lcms Liste" <[EMAIL PROTECTED]> Sent: Wednesday, August 04, 2004 6:14 PM Subject: [Lcms-user] chrm tag Hi, what is the purpouse of the chrm - chromaticityType encoding tag? I found it in several profiles created by lcms profilers. Arent the [r,g,b,k]XYZ tags allready enough? Marti, I am unshure with the above tag. I read the number of device channels and the encoded phosphors as uint16Numbers (2 bytes). As well your entyre tag has 40 bytes size - for 3 primaries are 36 enough arent they. Please tell some words about it? Thanks Kai-Uwe ------------------------------------------------------- This SF.Net email is sponsored by OSTG. Have you noticed the changes on Linux.com, ITManagersJournal and NewsForge in the past few weeks? Now, one more big change to announce. We are now OSTG- Open Source Technology Group. Come see the changes on the new OSTG site. www.ostg.com _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user ------------------------------------------------------- This SF.Net email is sponsored by OSTG. Have you noticed the changes on Linux.com, ITManagersJournal and NewsForge in the past few weeks? Now, one more big change to announce. We are now OSTG- Open Source Technology Group. Come see the changes on the new OSTG site. www.ostg.com _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user
