I can't use the gradient tool at all. I have a certain area selected, and try to use the shape gradient in that area, but I just can't! There's a circleslash on the icon. I tried every shape, selecting and deselecting, on every layer, and it just isn't working.

  • Hello Tikkit, welcome to GDSE, we're glad to have you! Could you maybe edit your question and include a screenshot of what you are seeing? This issue may be caused by a number of things, it might be easier to spot if we can see what you see. You can read the introduction in help center on how to improve your question even further. Feel free to contribute to the site by asking more questions or answering questions. – PieBie Jul 31 '18 at 7:47

From your description you are trying to make a gradient on a color-indexed image (a GIF, possibly). The gradient tool cannot work on such images, you have to convert them to RGB (Image>Mode>RGB).

Note however that the gradient generates many colors. When exporting again in a color-indexed format such as Gimp, all the colors in the image will be shoe-horned into the 256 colors of the color map. Many colors of your image will shift a bit, resulting in a grainy/pixellated look.

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