: How to bisect a selection with GIMP? How can I cut a rectangular selection exactly in half, so that a 128-pixel long selection becomes 64 pixels long? I have this: I want to select just

@Margaret771

Bucket-fill the whole selection with the colour you want left in the bottom half, then:


pick the Rectangle Select tool again, click on the centre of the existing selection (to re-activate the tool on that same selection);
in the Tool Options dialogue Size field (y-dimension), append "/2" to the value currently displayed there (meaning divide by 2), and click on the centre of the selection again - the selection should change to just the upper half;
bucket-fill the new selection.

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