Re: MS Color Control Applet
Re: MS Color Control Applet
- Subject: Re: MS Color Control Applet
- From: Graeme Gill <email@hidden>
- Date: Tue, 04 Jul 2006 16:39:08 +1000
Roger Breton wrote:
Meaning: we'd still like to retain the choice of "real" rendering intent to
the screen but, because of ICC v4 bylaws, abscol to the screen is forced to
"morph" into relcol to the screen, right? Could you say in which section of
the specs the said restriction could be found, Graeme?
ICC V4.2, Page 33, Section 9.2.25 mediaWhitePointTag:
"Tag signature: ‘wtpt’ (77747074h)
Allowed tag type: XYZType
This tag, which is used for generating ICC-absolute colorimetric intent, specifies the XYZ
tristimulus values of the media white point. If the media is measured under an illumination source
which has a chromaticity other than D50, the measured values must be adjusted to D50 using the
chromaticAdaptationTag matrix before recording in the tag. For reflecting and transmitting media,
the tag values are specified relative to the perfect diffuser (which is normalized to a Y value of
1,0) for illuminant D50. For displays, the values specified must be those of D50 normalized such
that Y = 1,0 (i.e. 0,9642 1,0 0,8249).
See Clause 6 and Annex A for a more complete description of the use of the media white point."
The MediaWhitePointTag is the information a CMM uses to convert the
normal relative colorimetric representation used in a matrix or LUT,
back to absolute colorimetric.
Graeme Gill.
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