Color/Luminosity separation

Started 3 months ago | Discussions thread
gordonpritchard Veteran Member • Posts: 4,886
Re: Doesn't work this way, LAB is not helpful.

Currantos wrote:

gordonpritchard wrote:

Why not change to Lab mode then copy the L channel to a new document make your edits then copy that and paste back into the L channel of your original image?

somehow I was not able to do that.

It's like LAB locks you out.

Do you have a way to do that?

I copies the image to new file. Converted to LAB there. Went to channels, copied the luminosity.

But then when I tried pasting anywhere it won't let and same in reverse, it won't accept backward.

Would be nice to try

In Photoshop it's simple and the way I described. Here's more detail:

Convert your image to Lab mode.

View the channels.

Click on the L channel to select it. Make sure that the a and b channels are not selecteed.

To a select all of the L channel. (on MAC it's Command "a") Then copy (Command "c")

Then create a new document (Command N)

Make sure the new doc is in grayscale mode.

Then paste the L image in your clipboard into the new document.

Do your edits. Then flatten the image.

Then do a select all (Command a. Copy Command C.

Go back to your original Lab image. The L channel should still be the only channel that's still active and selected. If not make it so.

Then paste your edited image into that selected L channel.

Then you can convert the Lab image into RGB mode.

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