When I try to run color modification tools like right-click > Colors > Colorize (or any of the color tools, Brightness / Contrast, Hue / Saturation, etc). I click and nothing happens:

Dropdown menu chain

I click Colorize and nothing happens. The menu just goes away. Help!


Ah ha, I just noticed this itty bitty error message at the bottom of the screen:

enter image description here

I forgot my image is in indexed color mode, not RGB! My PNG used to be RGB, but compression software changed it to indexed. To get all the color tools working again, just convert it back to RGB:

enter image description here

Now color tools work, hooray!

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  • I feel a bit sheepish, but this gets me every time! I hope Google indexes some of these keywords so I find my own answer next time. :D – Jeff Ward Sep 11 '15 at 17:48
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    By the way, you can colorize an indexed-color image by editing its palette (manually). Especially if there are only 16 colors or less. It’s more customizable and resource-preserving. – Incnis Mrsi Sep 11 '15 at 20:16

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