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I opened a .jpg file that only contains one channel, whenever I try to add another image to the file, the other image also turns gray.

Why is this happening?

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I suspect your image mode is set to Grayscale. Change it to something else using the Image → Mode menu.

Image Mode menu

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Just to add to this answer, you will have to re-add any new images you dragged into this document now. Anything dragged in while it was Grayscale will have lost their color information. – TunaMaxx Dec 19 '13 at 17:16

Your mode is set to grayscale. Anything you put in there wil be gray. Change the mode to RGB.

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protected by Scott May 4 '15 at 2:11

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