One of the things that Photoshop introduced, as I understand it, is
selective JPEG compression. Only the pixels that get changed by a
photo manipulation get a new jpeg compression. The pixels not changed
by manipulation are not recompressed anew. So opening and and doing a
jpeg save repeatedly in PS does nothing unless you change the
compression parameters or change the file.
Winsor
Long Beach, California, USA
On Apr 9, 2007, at 1:15 PM, Richard Ociepka wrote:
> Using Photoshop I opened and saved a JPEG 25 times without any
> noticeable degradation.
> The file size also increases a little on every save.
>
> However, with ACDSee9 there was a noticeable loss after only 5 saves.
> http://www.pbase.com/ociepka/psc
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|