What does hue rotate do?

It rotates every color by the same amount on the color wheel, so greens become blues and so on.

Does it change brightness?

No. Only the hue changes; lightness and saturation stay the same.

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Shift the colors of any photo by 90° on the color wheel. Fun, instant and fully local. Free, no signup.

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What does hue rotate do?: It rotates every color by the same amount on the color wheel, so greens become blues and so on.
Does it change brightness?: No. Only the hue changes; lightness and saturation stay the same.