0-255 Levels for RGB Composit

NP
Posted By
neil_poulsen
Nov 4, 2003
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316
Replies
3
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Closed
How does Adobe Photoshop arrive at the RGB composit 0-255 level value for a pixel, given the individual levels (0-255) for each of the colors Red, Green, Blue for the same pixel? Is it a simple average?

For example, invoking Image|Adjustments|Levels will bring up a histogram of these levels. How is the RGB composit level calculated for a pixel given the individual R, G, B levels for that pixel?
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CC
Chris_Cox
Nov 4, 2003
That depends on the blending mode, pixel transparency and opacity settings.

And the exact math is pretty long and complex.
NP
neil_poulsen
Nov 5, 2003
Is it a linear combination, or does it involve non-linear expressions?
CC
Chris_Cox
Nov 9, 2003
That depends on the blending mode.

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