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Maybe a first pass filter would be "has a selection been made according to the image content".

So an unsharp mask would be a no, unless it was applied to background or everything except faces (for example).

Things like white balance don't count, unless you are selective according to the image content; so you could white-balance according to the whole-image statistics, but _not_ "recognise the is a face and use white-balance to, eg, lighten or reduce contrast in that area".




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