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Why does Absolute Colormetric render..

josephjason
Why does Absolute Colormetric render a yellowish tone to the pictures?

If anyone knows the technical reason for this I would really, really appreciate it. (p.s. not trying to get rid of it or anything, just trying to understand the way the different color prefs relate to output)

Thanks all!
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Comments

7 comments

Date Votes
  • Drew Altdo
    As a simplified explanation;
    Absolute Colormetric does not shift your colors to accommodate a shrinking color space. It is, be definition, Absolute. That being the case, by happenstance, the Yellow is almost completely retained (being a midpoint between the three color points... Red, Green and Blue) while deeper Blues, Reds and Greens are shortchanged. So, the yellow stays Absolute in regard to the other colors. If you were to use Relative Colormetric, the other colors would change Relative to eachother.
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  • josephjason
    Thank you Drew! very interesting.
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  • thowi
    [quote="Drew " wrote:
    As a simplified explanation;
    Absolute Colormetric does not shift your colors to accommodate a shrinking color space. It is, be definition, Absolute. That being the case, by happenstance, the Yellow is almost completely retained (being a midpoint between the three color points... Red, Green and Blue) while deeper Blues, Reds and Greens are shortchanged. So, the yellow stays Absolute in regard to the other colors. If you were to use Relative Colormetric, the other colors would change Relative to eachother.
    ??

    Abs.col = rel.col + media white point (+ media contrast range)
    In other words: both intends use the same (rel.col) tables but with abs.col. the "color tint" (and contrast) of the paper profiles (or other target media) is being taken into account... i.e. the color managment tries to equalize the different white points (and contrast ranges).
    So if your paper profile actually shows a slight blueish tint (mostly due to OBAs) the color management spins the white point of the target profile towards the white point of the source profile. As the target is blueish... the color management spins the white point towards yellow.
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  • Drew Altdo
    [quote="Drew " wrote:
    As a simplified explanation
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  • josephjason
    [quote="thowi" wrote:
    Abs.col = rel.col + media white point (+ media contrast range)
    In other words: both intends use the same (rel.col) tables but with abs.col. the "color tint" (and contrast) of the paper profiles (or other target media) is being taken into account... i.e. the color managment tries to equalize the different white points (and contrast ranges).
    So if your paper profile actually shows a slight blueish tint (mostly due to OBAs) the color management spins the white point of the target profile towards the white point of the source profile. As the target is blueish... the color management spins the white point towards yellow.


    Forgive my ignorance, but where would C1 be able to pickup "paper profile" info from? A paper profile is something I would choose when printing from PS, but how would C1 know what paper profile I'm going to use beforehand?

    If I forget that, and just go with "target profile" (as in AdobeRGB, sRGB etc.) it makes more sense. So in absolute, C1 will put the image white point at a certain number without regard to the destination profile, essentially NOT color managing the file, simply passing absolute values? (Sorry again, I'm dumb.)
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  • Paul Steunebrink
    The paper profile can be read as print profile here, I suppose. CO5 Pro/DB are able to do soft proofing for that matter. This is that you (temporarily) select that print profile and see what happens on screen.
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  • thowi
    [quote="josephjason" wrote:
    If I forget that, and just go with "target profile" (as in AdobeRGB, sRGB etc.) it makes more sense. So in absolute, C1 will put the image white point at a certain number without regard to the destination profile, essentially NOT color managing the file, simply passing absolute values? (Sorry again, I'm dumb.)
    so you are seeing a difference when you switch from rel.col to abs.col with AdobeRGB as target profile? This is actually not possible as the only rendering intend matrix profiles (AdobeRGB, sRGB ...) are capable of is rel.col.
    So if you are seeing a change of the white point when switching from rel.col to abs.col your proof setting are most likely set to a worng profile. Go to "View"->"Proof Profile" and set "Selected Recipe".
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