In search of a D50 Editing colorspace
In search of a D50 Editing colorspace
- Subject: In search of a D50 Editing colorspace
- From: Peter Miles <email@hidden>
- Date: Wed, 03 Sep 2014 16:30:53 -0700
Lars Borg wrote..
Or please show me a case where the above doesn't hold true.
It's just that on occasions I'm calculating RGB values for the AdobeRGB space from a spectral measurement from a real object using Spectrashop.
For example the artist I previously mentioned has wanted in the past to print the colors of a colorchecker chart with an absolute match.
If I calculate the RGB values for AdobeRGB with the observer illuminant as D65, then for the neutral samples I get approximately R=G=B. However when I print it absolute colorimetric from photoshop on our print set-up these neutrals comes out neural relative to D50 on the print. I.e is no longer an absolute match the observer illuminant I asked for.
So I figured that it would be much easier for me to get absolute matches to the observer illuminant I ask for if my editing colorsapces started out as D50 in the first place.
Regards
Peter
________________________________
From: Lars Borg <email@hidden>
To: Colorsync List <email@hidden>
Sent: Thursday, 4 September 2014, 6:34
Subject: Re: In search of a D50 Editing colorspace
A key point that many seem to have missed:
With ICC profiles, ALL editing spaces are effectively D50, including sRGB.
If you examine for example the sRGB profile, you'll find that it converts
device values to D50 colorimetry.
You'll also find that the chromaticities in the XYZ tags don't match the
sRGB spec, as they've been chromatically adapted to D50.
It has a non-D50 white point tag, but this is not used for relative
colorimetric. It's very useful for finding the original D65
chromaticities, though.
So in the search of a properly sized workspace profile, no need to limit
your search to a D50 white point.
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