On Fri, Jun 09, 2000 at 12:24:35PM +0200, Andreas Haack <[EMAIL PROTECTED]> wrote:
> it saved with using save (Ctrl-S). I assume the original once are not recorded
> in the image,
> so how could I be shure that the quality is perserved.

Just do not use JPEG ;) In general it is impossible to do what you want,
especially if some other program wrote the JPEG.

In practise you should save the JPEG in a quality very near the original
quality. It is also possible to guess the quality (my "judge" program does
something similar to this, for example), but it is very difficult. (Also,
one might not want to "judge" the quality of the image, but the quality of
the quantization factor instead).

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