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Author Topic: Expose for highlights and.....?  (Read 13109 times)

joofa

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Expose for highlights and.....?
« Reply #40 on: July 25, 2008, 04:45:59 pm »

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Depends on how you think about it. For pure WB you just need a diagonal matrix (which performs a non-uniform scaling operation, which is what Bill described). This produces neutral grays, as desired, but also produces awful colors because camera color response doesn't match human visual response. That's where camera color profiles come into play. If you want to characterize a RGB camera using a simple 3x3 matrix, then in general the off-diagonal elements of the matrix would be non-zero. You can either think of the color mapping as two steps: first a WB diagonal matrix applied, followed by a color matrix ... or as a single step where the WB and color matrix have been pre-multiplied together.
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Yes, you are right. Thanks for taking the time to explain it in detail.
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