RE: Silly question department, Display Media White Point
RE: Silly question department, Display Media White Point
- Subject: RE: Silly question department, Display Media White Point
- From: Roger Breton <email@hidden>
- Date: Sat, 21 Feb 2015 10:01:18 -0500
Lars,
You hit an important point.
I certainly don't like the D65 white points of sRGB and AdobeRGB.
It's easy enough to generate a D50 flavor of both of those profiles with Photoshop -- thank you so much, by the way, for allowing this basic profile white point modification. It sure does the job.
But I will confide that I much prefer to adopt a D50-base profile altogether, like eciRGB and BetaRGB, when I feel the need to experiment with "true" D50-based profiles.
I like the fact that eciRGB has a "graphic arts"-ready D50 device white point. I like that feature a lot. I think it even made my life easier in the past at times I tried my hands at tracing through the internal transforms from RGB to XYZ, in Excel, using only the profile information, to compare with Photoshop's own conversion results, since there is no chromatic adaptation transform involved with D50-based device white points (no Bradford matrixes, straight through matrix multiplications).
I also like the idea that eciRGB uses L* as a transfer function. But that's not the most important benefit to me.
Although I could switch to eciRGB for all my work -- and I probably should -- I still stick with sRGB, partly because I count on the fact that, in relative terms, R=G=B=255 maps out to the monitor R=G=B=255 in Photoshop, so its D65 device white point becomes a lesser evil (please correct me if I am wrong).
And I *still* find value in converting AbsCol to Lab in Photoshop and obtain a bluish white, for pedagogical purposes.
a) I think your team of engineers could have come up with a different solution to handle the odd case when users "accidentally" selected AbsCol when converting from sRGB or AdobeRGB to anySpaceCMYK_or_RGB (it's easy enough to make the AbsCol intent grayed out in the ConvertToProfile's dialog Rendering Intent menu or simply to revert to RelCol in an Image>Mode>Space change);
b) There could have been a preference in Color Conversion Settings for "Enable D65 full support". That wouldn't have been the end of the world?
c) It is never too late to do the job right ;-)
Best / Roger
-----Original Message-----
From: colorsync-users-bounces+graxx=email@hidden [mailto:colorsync-users-bounces+graxx=email@hidden] On Behalf Of Lars Borg
Sent: 20 février 2015 20:08
To: Mark Stegman
Cc: ColorSync
Subject: Re: Silly question department, Display Media White Point
sRGB has the same "problem" as Adobe RGB and MOST RGB spaces that don't have a D50 device white point.
>2. Has sRGB already taken on this role?
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| References: | |
| | >Silly question department, Display Media White Point (From: Roger Breton <email@hidden>) |
| | >Re: Silly question department, Display Media White Point (From: Graeme Gill <email@hidden>) |
| | >Re: Silly question department, Display Media White Point (From: Lars Borg <email@hidden>) |
| | >Re: Silly question department, Display Media White Point (From: Steve Upton <email@hidden>) |
| | >Re: Silly question department, Display Media White Point (From: Mark Stegman <email@hidden>) |
| | >Re: Silly question department, Display Media White Point (From: Lars Borg <email@hidden>) |
| | >RE: Silly question department, Display Media White Point (From: Roger Breton <email@hidden>) |
| | >Re: Silly question department, Display Media White Point (From: Andrew Rodney <email@hidden>) |
| | >RE: Silly question department, Display Media White Point (From: Roger Breton <email@hidden>) |
| | >Re: Silly question department, Display Media White Point (From: Andrew Rodney <email@hidden>) |
| | >RE: Silly question department, Display Media White Point (From: Roger Breton <email@hidden>) |
| | >Re: Silly question department, Display Media White Point (From: Mark Stegman <email@hidden>) |
| | >Re: Silly question department, Display Media White Point (From: Lars Borg <email@hidden>) |