At the risk of committing a mailing list etiquette fopah...
I'm reposting as I got no response and I am hoping one of the developers
can actually shed light on this:
On 5/3/2012 8:15 AM, Jay Smith wrote:
Jonathan, I hope that you realized that when editing a JPG, repeatedly
saving/exporting to JPG (your step 4) reduces the quality (actually
compresses / deletes data).
GIMP doesn't reload the file after exporting, does it?
If not, then the image in the GIMP's buffer should be the same high
quality image it was prior to the export.
Given that, as long as you don't exit the GIMP or reload the image from
the exported file, multiple exports to a lossy format shouldn't cause
loss of quality.
For example, if you do an export to jpeg and compress down to 15%, with
the preview option set you can clearly see the loss of quality in the
written image. However, when the export is complete, the image in the
buffer reverts to the high quality it was prior to the export.
This implies multiple exports to a lossy format should *not* result in
loss of image quality. However, *re-loading* an image previously saved
to a lossy format and then exporting again will result in degradation.
Is there something I'm missing?
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