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If you rotate by 90 degrees, all the software has to do is move the dots around to new positions, keeping every dot exactly the same as it was before, just putting it in a new position. But if you rotate by any other angle, the software has to interpolate - i.e., guess at - the colour to assign to each of the new dots. The "new dot" doesn't line up exactly with any of the "old dots" so the software takes a weighted average of the old dots that surround the position of the new dot. Obviously, the result involves some loss of quality. There is no difference between doing this with a JPG or TIFF or any other raster graphics format. Note, however, that the other differences between different file formats still apply: i.e., BMPs remain accurate across generations but huge and clumsy, JPGs drop quality with successive generations (if you are silly enough to use JPG for multiple iterations instead of converting to BMP or TIFF, manipulating, and converting back), and so on. |
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