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LAB image - adjusting levels like photoshop

Sep 11, 2015 at 10:57 AM

i know there´s an option to adjust the levels, but i can not find a manual how to do it for a LAB 16Bit image. In photoshop i have the following dialogue:


And i can adjust the L, A and B channel.

I am looking just for a short example, how can i control the LAB channels, for an RGB is clear, but i did not find the code for an LAB image. Thanks in advance.
Sep 11, 2015 at 8:01 PM
When you have a LAB image then L = R, A = G and B = B.