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I am editing an image in GIMP that has a few nearly-transparent (resp. very light) pixels scattered through an otherwise transparent (resp. pure white) background.

Is there a command that will quickly highlight or otherwise indicate pixels that are not the background color (i.e. white or transparent, depending on whether there's an alpha channel), so that I can clear them?

(I could just set the similar-color threshold to 0 and flood-fill, but that takes many clicks, and I have to either duplicate the layer first or remember where all the stray pixels are.)

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In Photoshop you could load the alpha channel of the layer as a selection and as long as the stray pixels are more than 50% opaque, they'd get highlighted by the selection marquee. – nine9ths Dec 1 '12 at 5:21

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