In article , Bill Tuthill wrote:
In rec.photo.digital Fed-Up-With-Corel wrote:

Unless you use an editor that is able to edit JPEG files
without recompressing the whole image every time you save it.
PhotoLine 32 www.pl32.com is the only one I know of that
allows you to edit a JPG file where the only data that gets
put through the compression routine again when you save it
is that which you specifically edit or change from the original.

JPEG Wizard also did/does this to a certain extent.

AFAIK only on selective compression areas, or limited area processing such
as red-eye removal. Then again, it really isn't an editor, per se; more
of an image manipulator and processor. I'd imagine if you were to make any
global change, such as color balance adjustment, that would require
reprocessing in order to save the modified image.