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Subject: Re: raw 3.1 professional custom profiles for highend digital cameras





For each supported camera, Camera Raw contains two matrix RGB profiles,
one built under Illuminant A, the other under D65. (The profiles were
built by Thomas Knoll using his own proprietary profiling tools, which
I suspect are better than anything on the market if the CMYK profiles
bundled with Photoshop are any indication.) The white balance controls
interpolate between (and extrapolate beyond) these two profiles.




if I want to compensate an image shot at sunset, how is an illuminant A response going to help?

There is no need for "scene-referred" colorimetry or "output referred" colorimetry, there is just a need for measuring the linear response colorimetry of the capture ccd. I don't believe that the ACR internal profiles are any different than linear gamma, matrix based ICC profiles.

And I should be able to select that profile based on image editing needs, it should not be selected for me based on a colortemp slider. A different colorresponse due to different lighting conditions is in fact completely unrelated to colortemp.

So, why aren't we able to build linear, matix-based ICC profiles to replace the internal profiles of ACR?

Or, if it has to be simplified, why not add a "Response Type" popup with choice of "Daylight", "Incandescent", "Fluorescent" etc and then have the colortemp slider interpolate between profiles that actually are relevant. I doubt that Thomas is willing to build that many profiles for each camera, but hey, that's why I asked: why aren't we able to build linear matix-based ICC profiles to replace the internal profiles of ACR?

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