Achei: No livro do Thom Hogan, "The Complete Guide to the D50", pág. 143:
"If any of the files you copied in Step 3 are JPEG files
you should also consider immediately using a product
that’ll resave them in a form without compression (you
can set up a Photoshop Action, for example, to take
all the files in a folder and save a
.TIF or .PSD version
for editing). If you don’t perform this step, then you’ll
need to be attentive when you open files for
manipulation, since some software applies JPEG
compression every time you save a file in the JPEG
format (i.e., you could end up compressing previously
compressed files, adding artifacts). Fortunately,
Photoshop versions 6.0 and later don’t do that, but
beware of touching your JPEG files with other
products. (Note also that some programs can perform
image rotation without recompressing JPEG images,
and some don’t. I find it safer to avoid the problem
entirely by moving my files out of JPEG format as soon
as possible, even before rotating them.) "
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