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I already know how to make a shape distortion.

But, I can't really figure out how to make 'color' distortion like the 'spectrum' in the example below.

enter image description here

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    Distort color channel not layer. Commented Jul 4, 2016 at 7:33
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    Hi mahdo, thanks for your question. Could you tell us what you tried that didn't work? Always good to show some effort, and your chances for a good answer increase. If you have any questions, please see the help center or ping one of us in the Graphic Design Chat once your reputation is sufficient (20). Keep contributing and enjoy the site!
    – Vincent
    Commented Jul 4, 2016 at 15:05

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To start & keep it simple > flatten your image and go to RGB mode. Open the channels palette and select the Red channel only. It should be the only selected channel (should be light-blue). Create a selection and move the selection & artwork around a bit. Now go back to the RGB channel (all should be light-blue). Now do the same for the other channels. Something like this happens.

enter image description here

Keep in mind you can also paste black and white images into these channels (since the black you see is a representation of the red or the green or the blue). Where these tints mix the spectrum appears.

So you could create 3 different layers of your image in black & white and paste each layer into the R, G & B channels until you are happy with the result. You just need to visualise it in your head and create the b&w layers on top of each other so you get some idea.

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