Steve Simon wrote:
It's even more used in digital cameras, which most of them store to JPEG directly. Therefore, the image file has a downsampled color space, blocking effects, etc. The result is much better if you photo double the resolution wanted, and then scale by software (even with a simple scaling algorithm).This is why people use 14bit scanners running at 4096dpi and the like, only to downsample to 640x480x8bit. You will always get better results if you throw away resolution cleanly using well designed digital filter than to use a low-res scanner directly.
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