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I haven't found a way to scale based on aspect ratio:

enter image description here Scaling with keep aspect option (chain icon) disabled can be used when fixing images stretched from 4:3 to a widescreen resolution, for example.
I can set resolution for my aspect ratio manually, but that of course isn't optimal.

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    What abut this: Unselect the "chain". If your aspect ratio is X:Y, set the width to X and the height to Y. Now, turn the chain on again, change the Width and the height will be recomputed (to satisfy your ratio). – Ivan Kuckir May 28 '17 at 15:26
  • You mean in width/height or X/Y? – user598527 May 28 '17 at 15:36
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You can use (simple) mathematical expressions in the entry fields. For instance to resize your image to 4:3, keep the height (1080) and in the width field enter 1080*4/3.

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