Re: 'gamt' tag
Re: 'gamt' tag
- Subject: Re: 'gamt' tag
- From: Steve Upton <email@hidden>
- Date: Tue, 22 Feb 2005 12:31:14 -0800
At 1:31 PM -0500 2/22/05, Mike Eddington wrote:
>I'm viewing a profile's gamut in the Colorsync utility via the gamt tag.
>Comparing the gamuts of two profiles created with the same data, I
>notice that a Gretag gamut appears much larger and smoother when viewed
>through this tag (gamt) than the Monaco gamut, which is very wavy and
>much smaller. I assume the size is due to Gretags reported 16 bit, PCS
>to gamut check table, while a Monaco profile shows an 8-bit, PCS to
>gamut check table, but why is the latter so wavy? I selected 16 color
>values when creating the Monaco profile...am I misunderstanding the
>point of this feature in Monaco? I understand that this tag gives
>information on out of gamut colors, but I have a hard time interpreting
>it.
I found that the gamut tag was so inconsistently created in profiles (and not well documented in the 2.x spec) that I was unable to think of a single reason why I would want to rely on its information. At the time Chris Cox mentioned that Adobe had come to the same conclusions and so I developed the gamut boundary algorithms that became ColorThink's 2 and 3D graphing...
As far as I know it is now better documented in the v4 spec but who knows when that will actually show up in better gamut tags....
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
o ColorThink ColorValet and now... ColorForums.com
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| | >'gamt' tag (From: "Mike Eddington" <email@hidden>) |