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Can someone from Adobe please help with this? I am working with a scanner manufacturer to debug their software, and I need to know how Photoshop calculates an L value displayed in the Luminosity histogram (or info palette) from the individual RGB values in a pixel.
I originally thought it was simply the average of R, G, and B, but it’s not.
For instance, an image completely filled with the color R=125 G=156 B=223 gives L=154 in the histogram dialog box (but in Lab color in the Info palette, L=64.)
I’ll appreciate a clear explanation, inquiring minds want to know!
Thanks,
-Chris.
I originally thought it was simply the average of R, G, and B, but it’s not.
For instance, an image completely filled with the color R=125 G=156 B=223 gives L=154 in the histogram dialog box (but in Lab color in the Info palette, L=64.)
I’ll appreciate a clear explanation, inquiring minds want to know!
Thanks,
-Chris.
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