Re: colorsync profiles containing 'vcgt' tag
Re: colorsync profiles containing 'vcgt' tag
- Subject: Re: colorsync profiles containing 'vcgt' tag
- From: email@hidden
- Date: Fri, 26 Oct 2001 09:00:32 EDT
In a message dated 10/25/01 7:08:40 PM, email@hidden writes:
>
We have some monitor calibration software that exports
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monitor profiles containing a 'vcgt' tag. Under OS 9
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the gamma table is correctly installed when I set this
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profile as the default monitor profile. On a OSX box
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the profile doesn't seem to have any effect. Any
>
developers have advice how I can begin to debug this?
This is the Video Card Gamma Tag, and contains the data downloaded to the
RG&B channels of the video card to adjust the color. Older cards may not
accept this type of download under Windows, but OS X should use it just fine.
Certainly there have ben problems with custom monitor profiles under OS X,
however. Are you sure this tag is the culprit, and that it is not some
specific detail of the data within this tag? I'd try copying and pasting the
VCGT from some profile that works into the one that doesn't and see if that
fixes it, just as a test.
C. David Tobie
Design Cooperative
email@hidden