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> simple 1x1 resize

How is it "simple"? There are like a ton of different downscaling algorithms and each of them might produce a different result.

Cool article otherwise.

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At 1x1 I don't expect any difference. It would be the average of all pixels in the image if you don't unevenly weight them (which you might decide when choosing a main color, but no downscaling algorithm would do) and the only difference is whether you remembered to gamma-correct.

Nearest-neighbor interpolation may pick just one pixel closest to the center.

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