On Mon, Mar 14, 2011 at 06:58:50PM +0200, A.K. wrote:
> Package: libjpeg-progs
> Version: 8b-1
> Severity: wishlist

Hello, sorry for the delay. I forwarded it to upstream but forget to
send you the answer.

> There is no linux program I can find that can change the jpeg header so
> that image remains the same but ppi information is changed. Sometimes
> one is requered to provide an image with a minimum of 300dpi.

Technically this belongs to the JFIF header not the JPEG header.

> I see jpegtran a natural fit for that since it does various
> manipulations of the jpeg headers already.

Upstream suggests to add it to wrjpgcom.

> One option is to modify exif headers but then not all programs regard to
> them. Another option is to use gimp but then you either have to transfer large
> files or lose quality by recompressing the resulting image back to jpeg.
> 
> I can't find any information how to contact jpegtran upstream maintainer
> (if any).

Sure there is, see /usr/share/doc/libjpeg8/README.gz

Cheers,
-- 
Bill. <ballo...@debian.org>

Imagine a large red swirl here. 


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