Quote:
Originally Posted by Dist
Then how do you explain the quality loss if it doesn't convert anything to gif ?
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In the example you posted at least, there is no quality loss. In fact, the two files are identical with the same file size and CRC32 signature (meaning it's the exact same data, just given a different file name). So if you perceive a quality loss in that case... well, it's just perception.
Perhaps there is a situation where the forum software might try to resize an image if it falls outside of the normal bounds? I'm not sure about that though. If the server did do some adjustment, then any sort of re-compression to a lossy format could cause some artifacting or distortion. But again, I don't know if the forum does such a thing.