RE: Black Point Compensation (BPC) - another track
RE: Black Point Compensation (BPC) - another track
- Subject: RE: Black Point Compensation (BPC) - another track
- From: Roger <email@hidden>
- Date: Sun, 08 Feb 2009 16:06:45 -0500
Hi Wilma,
I think if you still use BPC in Photoshop, you will not get an RGB value of
[0 0 0] mapped to an L* of 11 in the PCS -- if you assign the "noBPC"
profile. But if you assign the "BPC" profile, it does not matter whether the
BPC setting is checked or unchecked, you will get an L* of 0 in the PCS.
Only the "noBPC" profile actually scales the black point.
Is that consistent with your findings?
Roger Breton
> Both profiles have a MediaBlackPoint
> tag declaring a black point of XYZ = [0.0121 0.0123 0.0103], which I
> find
> strange.. An RGB value of [0 0 0] would
> get mapped to an L* of almost 11 in the PCS. If informative, it is
> wrong for one of them (...withBPC) and if it
> demands CMM action, it is wrong for the other (...noBPC).
>
> So if, as consensus seems to have it
> from the Forum, BPC is a CMM operation, how could these sRGB source
> profiles
> have properties related to BPC and be so named. Why would I want to
> have a "flare" factor added to my images
> with the ..noBPC profile? How would one
> actually use the .noBPC profile?
>
> Thanks in advance,
>
> Wilma
> Pittsford, NY
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