: GIMP: Setting entire foreground to a particular colour In GIMP version 2.8, I have an image with a black foreground, and a transparent background. I want to set the entire foreground to red,

@Shelley591

You should select the background with the color select tool, then invert the selection (CTRL+I) and there you go, you have selected the entire foreground, including the 'grey' pixels, which actually are black pixels with transparency.

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@Merenda852

The gray pixels aren't grey, they are partially transparent black pixels. If you replace black, you want to keep that partial transparency because this is what gives smooth edges. And there is an easy solution:


Set the alpha-lock of the layer (this is the checkerboard icon at the top of the Layers list).
Do not use selection.
Bucket-fill the layer with the required color. The alpha-lock will preserve the opacity of the pixels.


A different solution (that gives a strictly identical result):


On the foreground layer: Layer>Transparency>Alpha to selection
Hide/Discard the foreground layer
Add a new transparent layer
Bucket-fill the selection on that layer.

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