I think the situation may be far more complex that what you describe. ImageQuote:>I need to know what specific calculations Photoshop applies to an
> image when, using the gray point eyedropper in the Levels dialog box,
> I select a gray pixel in my image. Specifically, I need to know the
> algorithm the software applies to each of the R, G, and B channels in
> each pixel when a gray point is selected. For example, in a microscope
> camera software I use (Olympus Microsuite), when you select a gray
> point pixel, the software calculates the average 0-255 intensity value
> across the R, G, and B channels for that pixel. It then calculates a
> correction factor for each channel in that pixel by dividing the
> intensity value in each channel by the average intensity value. These
> correction factors are then applied to the rest of the image. So, for
> example, if the RGB values for the selected gray point pixel are
> (R,G,B)=(100, 200, 200), then the average intensity=100+200+200)/
> 3=167. The correction factor for the R channel=167/100, for the G
> channel=167/200, and for the B channel=167/200. These correction
> factors are then applied to the rest of the image. Does Photoshop use
> this same algorithm, or something different? I need this level of
> detail for describing my methods in a scientific paper I'm writing.
> Thanks so much!
Mention .icc profiles and color management to the Olympus salesman and see
what kind of reaction you get.
If I take a digital picture which includes a Kodak gray card, can I select
that with the gray eye dropper in Levels and get a true color match?
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7. Gray point