Re: [Gimp-developer] JPEG lossless operations?

[gfxuser <gfx user online de>]

Ofnuts wrote:
> On 05/27/2012 08:26 PM, gfxuser wrote:
> > Hi,
> >
> > reading some of the JPEG related articles here I wondered whether 
> > GIMP or GEGL can do lossless rotation and cropping on JPEG images. 
> > Can you tell me more about it?
> >
> > Thanks,
> > grafxuser
>
> For rotation, that would only work on images with dimensions that are 
> a multiple of 8. For cropping, that only works if you crop on 8-pixel 
> boundaries from the origin corner.
>
> Otherwise, this also assumes that JPEG is an "editable format", while 
> the recent kerfuffle around the Export function has demonstrated that 
> it is not, in the current vision.
Thanks, Ofnuts.
Yes, 'Export vs. Save' was a long discussion and I don't want to boost 
it again. Although it takes a little getting used to I can live with the 
new behaviour. Despite of that I sometimes wondered in the past whether 
GIMP will introduce new compression artifacts if I rotated or cropped an 
existing JPEG image (yes, there are some cameras where saving in JPEG of 
sufficient quality is the best choice. Shall we not use them anymore?).

Best regards,

grafxuser