lab luminance versus blended luminance- why the difference??

AS
Posted By
AK Schmidt
Apr 26, 2004
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237
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Here’s one I can’t figure out: Why does replacing the luminance in lab mode with another luminance produce a different result than blending in a luminance layer? Time and time again, I’ve tried both procedures with identical files and the replacing of the lab mode luminance always produces a different result, but I really don’t think it should be that way (shouldn’t either method be producing the same results??). Any ideas and does anyone else just replace their lab luminances?

thanks,
AK Schmidt
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MR
Mike Russell
Apr 27, 2004
AK Schmidt wrote:
Here’s one I can’t figure out: Why does replacing the luminance in lab mode with another luminance produce a different result than blending in a luminance layer? Time and time again, I’ve tried both procedures with identical files and the replacing of the lab mode luminance always produces a different result, but I really don’t think it should be that way (shouldn’t either method be producing the same results??). Any ideas and does anyone else just replace their lab luminances?

thanks,
AK Schmidt

The two are based on a completely different calculation.

I answered this in more detail in alt.graphics.photoshop. —

Mike Russell
www.curvemeister.com
www.geigy.2y.net

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