edit: I stand corrected re abscol.

With Adobe's CMM (i.e. ACE) the only RI available is relcol.

Apple CMM does take the different white points into account as does C1's and RAW Developper's CMM.

AbsCol between matrix spaces was definitively possible with Adobe’s color engine in former Photoshop CS.

It does not seem to be possible anymore with Adobe’s color engine in CS 4. As suggested above, changing to Microsoft’s ICM does the trick– for the purpose of testing.

Re. > We start in raw and it is assigning colour profile operation, typical for input devices. Only after that comes conversion.

... but please tell me one converter that can convert from the input profile to a matrix based working space with any other RI than relcol.

Following details on ACR’s matrix profiles were given by Thomas Knoll (Feb. 2004, Rob Galbraith Forum).

It predates the more complex dng profiles which we have now.

Anyway, I’d be surprised if the initial conversion of demosaiced "RAW" RGB data to linear gamma ProPhoto RGB (via such matrices) would include a RelCol-type chromatic adaptation of the white point. It would seem to counteract the sense of the Temp. and Tint slider. Of course, I can’t know.

Peter

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Quote: >> Camera Raw has 3 by 3 matrix values built in for all its supported cameras (actually two sets, one for 2850K and one for D65, and uses interpolation between them). But these values are measured from one camera (or at most a few averaged). So the 3 by 3 matrix is unlikely to exactly match any given user's camera. Non-standard lightling can also require a different 3 by 3 matrix. So Camera Raw provides a way to tweak this matrix via its controls. A 3 by 3 matrix has 9 degrees of freedom, since it has nine numbers. If you want to tweak 9 degrees of freedom using slider controls, you need nine sliders.

The first degree of freedom is overall scale. This is controlled by the "Exposure" slider. The next two degrees of freedom are the white balance, which are controled by the "Temperature" and "Tint" sliders.

That leaves six degrees of freedom. The usual way these are represented graphically is as a triangle plotted in xy space. The corners of the triangle are the xy coordinates of the red, green and blue primaries of the camera's color space, and define the camera's gamut. What Camera Raw's six hue/sat sliders in the calibration pane are doing is moving the xy coordinates of the triangle corners. <<