--- [EMAIL PROTECTED] wrote: > Re-encoding *unchanged* data at the same compression setting > gives > no additional loss.
It does give an additional loss. Nevertheless, the additional loss is very small, much smaller then what you lose when you store a tiff image with the highest jpeg quality in PS. > The question is whether flipping constitutes > changing, > and I think it probably doesn't, but I don't know the JPEG spec well > enough > to be sure. I am sure someone will. To flip an image you do not have to decode and code it again. You just re-arrange the DCT coefficients. Considering the jpeg algorithm I believe it will work only on images with a multiple of 8 pixels in the flipping direction. Robert __________________________________________________ Do You Yahoo!? Send FREE Valentine eCards with Yahoo! Greetings! http://greetings.yahoo.com ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body
