Yeah I mean crop, sorry.
I'll explain it a another way.
Original image is say 2500x2500
I'd like to crop the image so I've got a 2x3 version, and a 16x9 version, etc.
So the sizes would be 3x2 2500x1667, 16x9 2500x1406, 21x9 2500x1047, and 32x9 2500x703.
At the moment I'm using https://andrew.hedges.name/experiments/aspect_ratio/ and doing it all manually.