Re: a colorspace quandry
Re: a colorspace quandry
- Subject: Re: a colorspace quandry
- From: Doug Brightwell <email@hidden>
- Date: Sat, 14 Apr 2001 14:06:45 -0700
Bob...
Thanks for your comments. Couple of questions:
>
> 1. The actually CCD chip sees a huge color space, much bigger than the
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> scanner profile...
>
>
No, the scanner profile describes the performance of the CCD and its related
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circuitry that transforms its analog signals to digital data. A scanner
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profile is a source. Data is not being moved to it. Its describing the
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characteristics of data coming from a particular device
That makes perfect sense. Thanks for clarifying.
In the meantime, I've taken a comparative look at the Flextight and Ekta
Space profiles in Gretag's profile editor. I'm not savvy with Profile
Editor, and only use it to look at profile gamuts. The Flextight profile
seems to have more yellows and greens that Ekta Space doesn't. But Ekta
Space on the other hand seems to include some blues and cyans that Flextight
doesn't. The differences vary depending upon which graph view you choose.
So is converting from Flextight to Ekta moving from roughly the same size
spaces, or from bigger to smaller?
>
if the source space is smaller than the destination space, the a relative
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colorimetric transform and a perceptual transform should yield the same
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results. Perceptual transforms will squeeze data down from a larger space
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to maintain color relationships in a smaller space. It won't expand data
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when moving to a larger space.
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This makes it a bit more practical
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in some work flows to just tag files coming off the scanner with the scanner
>
profile and worry about how best to edit them later.
If I were to leave the scan in the Flextight profile, and converted it to
Ekta Space only once it's open in PS 6, would I want the conversion to be
perceptual, relative colormetric... or doesn't really matter?
Thanks,
Doug
--
Doug Brightwell
email@hidden
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Cell: (415) 608-7618
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