Re: EyeOne Monitor Profile
Re: EyeOne Monitor Profile
- Subject: Re: EyeOne Monitor Profile
- From: Chris Murphy <email@hidden>
- Date: Fri, 18 May 2001 09:23:05 -0600
>
We were hoping for a slightly more detailed statement; like what it does
>
with
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them, or whether there is any actual advantage to them in Photoshop, above
>
curve-only profiles.
I think there can be advantages to them, but since they are more complex,
care must be taken to ensure they remain well behaved especially in terms
of gray balance. A LUT based profile can break the concept of R=G=B
creating a neutral gray. If you create a neutral gray background of
128,128,128 and then go to Assign Profile, and specify an RGB device
profile (it's a LUT based profile), you will see a serious color shift
that is definitely not neutral - if you change the info palette to read
in Lab values, you'll see that it's definitely not a neutral color.
You can do the reverse by create a Lab document with a background of
50,0,0 and then use Convert to Profile to see what RGB values are needed
to make a neutral gray using an RGB device profile, and note they aren't
equal.
So while there are advantages (more points for one) in a LUT based
profile, it's possible for them to exhibit poor gray balance, and even
cross overs. Whoever makes LUT based profiles for use as working spaces
will have to do a good deal of testing.
Chris Murphy
Color Remedies (tm)
Boulder, CO
303-415-9932