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I have recently opened some images and in the layers palette, instead of saying "background" it says "Index".

I have been unable to figure out why it says "index" and cannot do anything to the image because every tool is greyed out. What's up? I must be doing something wrong.

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up vote 3 down vote accepted

Select Image > Mode > RGB color

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Thank you! Just curious - why does this happen in the first place? I am three weeks into learning the program, all relevant info is great. Thank you! – user27516 Jul 20 '14 at 23:50
This does not just happen. Someone indexed the image, possibly to reduce file size or use a specific color set. – KMSTR Jul 23 '14 at 6:31

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