Re: assigning profiles
Re: assigning profiles
- Subject: Re: assigning profiles
- From: Roger Breton <email@hidden>
- Date: Tue, 24 Sep 2002 23:58:45 -0400
>
David Wollmann wrote:
>
> It looks like ProfileCities ProfileManager can edit the white point for
>
> me. Currently those settings are
>
>
>
> L: 90.69
>
> a: -.69
>
> b: 2.5.
>
>
Changing the White point tag will have no effect, unless you are
>
using the profile with absolute intent. This is unlikely to
>
help you, since using absolute intent will likely make your
>
"scum dot" problem worse.
>
>
A properly constructed profile will have a color conversion
>
that is completely white point relative. What that
>
means is that for the relative colorimetric intent (or
>
default intent if it is a matrix profile), device
>
white will map to Lab 100, 0, 0, and 100, 0, 0 will
>
map to device white.
>
>
Graeme Gill.
At the risk of taking your point out-of-context, what you describe does not
seem to apply to digital camera profiles? Or should it? I mean, I have
worked with two different digital camera profiling packages and both don't
"have a color conversion that is completely white point relative". When
converting from device white (RGB=255,255,255) to Lab, they never give me
Lab = 100,0,0.
And that is confusing for me. I am under the impression, like you wrote,
that the Camera White point, whathever its colorimetry, when converted
"relatively", as in RelCol, should map to Lab 100,0,0.
Roger Breton
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