: Brightness-contrast does not operate on indexed layers I want to darken a PNG image in GIMP. I open it and choose Colors | Brightness-Contrast. The application responds with the error message

Posted in: #Gimp

I want to darken a PNG image in GIMP. I open it and choose Colors | Brightness-Contrast. The application responds with the error message - "brightness-contrast does not operate on indexed layers".

How can I darken the image?

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@Vandalay110

Whenever we have an indexed image source (e.g. 256 color palette) we will not be able to adjust brightness and contrast with Gimp.

To still do so we will have to convert the image mode to RGB first (Image > Mode > RGB), perform our adjustments and as a last step reduce the colors to indexed if needed.

Color and brightness adjustments of images with a reduced color depth may however not give us good result.

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: Brightness-contrast does not operate on indexed layers I want to darken a PNG image in GIMP. I open it and choose Colors | Brightness-Contrast. The application responds with the error message

More posts by @Shanna688

: Racially Sensitive Icons This could a very broad question, so bear with it. I was going through an article about Cleveland Indians and realized that the Logo for the team is racially insensitive.

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