Re: [gimp-devel] Re: JPEG correction (was Re: Gimp Wishes)

[Simon Budig]

Jon Winters ([EMAIL PROTECTED]) wrote:
> The only manipulation I can think of that would benefit from "lossless"
> jpeg would be rotating the image.  (if I were shooting low-rez)  I
> remember seeing some tools at the JPEG F.A.Q. site that would rotate a
> JPEG without damage.  http://www.faqs.org/faqs/jpeg-faq/

This lossless operations depend heavily on knowledge about
JPEG internals. They operate without de- and recompressing the
image data. You can use them with tools like jpegtran .

However, this is nothing to embed into Gimp. Gimp has a totally
different approach on storing image data and it is virtually
impossible to preserve the JPEG-internal data (parasites for all
JPEG-Coefficients - Urgh... ;-)

Bye,
        Simon
-- 
      [EMAIL PROTECTED]       http://www.home.unix-ag.org/simon/