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InDesign is more meant for designing layouts, not for your specific problem.
It seems that your crops are always made at the same coordinates and with identical width & height, is that correct?
If correct, you can indeed use slices. If at all possible, you'll achieve a higher final quality by downsizing instead of upscaling. Would that be possible? --> instead of x1 & x2, do x1 and x.5.
Saving under 1MB can be done by dividing the product of dimension & bit depth by your target size (1MB) in bits (ie: 8000000) to configure the saving quality from anywhere between 1 and 12.
saveQuality = Math.round(12 * (1 - dimDepth / targetSize))
Something of that nature anyway...
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Awesome, thanks for the tips!
So the individual crops and their respective 2x (or .5x) versions have to be identical but not between them. I totally agree about downsampling too; I'm just trying to speak the lingo of the UI designers now.
So for "saveQuality = Math.round(12 * (1 - dimDepth / targetSize))", where would that go exaclty? I haven't crossed the rubicon into scripting yet.
Thanks again!