Re: In search of a D50 Editing colorspace
Re: In search of a D50 Editing colorspace
- Subject: Re: In search of a D50 Editing colorspace
- From: Peter Miles <email@hidden>
- Date: Thu, 04 Sep 2014 12:24:47 +1200
I wrote..
> 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.
>
From the color of gray discussion, it's become apparent to me that in practice, all RGB source spaces will ink a print with a version of D50 "white" if the destination printer colorspace is CMYK and your printing Absolute colorimetic from Photoshop.
Thats because, while Adobe is ignoring the absolute rendering request for the first half of the transform from the source RGB space into the PCS , it's still honoring the request for the Absolute transform from the PCS into the destination printer space... if it happens to be a CMYK space.
or at least that s What I seem to be experiencing here.
So calculating an RGB value from a real world sample is a lot easier if the color space you dropping it into is D50.
Regards
Peter
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