Downsizing is usually OK even by larger percentages, but the image will become blurry. Sizing down throws away data, and if you are not resizing by a factor of two in both directions, there must be some math involved that decides how to deal with it. Many (most?) photos have the focus in the center, so you set up the crop so that the edges are cut (crop to the center).Īs far as resizing without quality loss, all resizing is a loss in quality. The other dimension will be larger than the desired final size on that axis, so you can crop to the image. As Scott pointed out: the only way to change proportions is to crop, but you can size the item as close to one of the desired final pixel dimensions first, and then crop.įor a naive (mechanical) way, you merely set the smallest dimension of the original image to the correct size for that dimension.
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