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Require some minimum resolution for images so we won't have all that pictures too small
Added on Aug 15 14:16
Its quick and easy to upscale images. Given the number of upscales on Google Images used to get page hits, I doubt this requirement would do much good. And sometimes there are no high-res versions of images.
The O.P.
Hyomil has some good points. The "minimum res requirement" could be made as just a warning though.
yah i agree