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It has always been my opinion (unsubstantiated by research) that detail will be best preserved when resizing where the calculation involves only "whole pixels" -- 25%, 50%, etc. With my camera, a 40% reduction (i.e. 5x5 pixels resampled to 2x2) gives me overall dimensions of 1126 x 845 pixels, close enough to the maximum allowed entry size, and it will usually fit under the 700kb limit at near-best JPEG quality. |
