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I want to fill a selection in gimp with one color and only that color. No color mixing between neighbor pixels. How can I do that?

When I fill a selection, gimp does it like in the image below on the left side. I want a result shown on the right side.

Left: selection with fill and blur at selection borders, Right: selection with pixelwise fill

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Switch the antialiasing off from the selection tool - It's in tool options.

enter image description here

No antialiasing creates other problems. You will need much higher resolution for the same apparent smoothness. Antialiasing is developed to prevent jaggy edges between 2 diffrent colors.

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If the selection is partial on some pixels, use Select>Sharpen (which is the same as thresholding the selection channel on the 50% mark).

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