On 06/17/2013 06:38 AM, Liam R E Quin wrote:
On Mon, 2013-06-17 at 00:52 +0200, Ofnuts wrote:
  if you only do local editing and save the image back with the
exact same JPEG quality settings, the "blocks" which no changed pixels
very quickly end up producing the very same data as their source in the
JPEG file in every editing cycle,
This depends on the sorts of edits you do.

For example, changing contrast or levels globally, or running a sharpen
filter, will often accentuate the original jpeg artifacts so that they
in turn create new artifacts.

(that's why I mentioned levels, curves and sharpen explicitly in the
post i made somewhere else in this thread).

Yes, this is why I said "local" editing.

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