Export image in Lab Color using only the A and B channels

Question

I’m working in Lab Color mode and I’m trying to isolate the A and B channels while completely removing the L channel. I also don’t want to keep the combined Lab channel.

What I want to achieve is to keep only the A + B data (color without luminance), turn that into a visible image, and be able to export/save it to JPEG/PNG/TIFF.

So far, copy, paste methods don’t give me the result I’m looking for, as the image becomes black and white, and I understand that A and B aren’t standalone image channels in the usual sense.

Is there a way to do this properly or a workaround that would allow me to visualize and export only the A and B information?

D Fosse · Accepted Answer

I’d simply fill the L channel with 50 (middle gray). That gives you a normal Lab image, but containing only the color information, that you can export or save to any other format you wish.

Stephen Marsh · Answer

Both the method that I mentioned, and the one from ​@D Fosseprovidethe same result:

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