I've read that Picasa (Google's program) might be able to perform lossless rotations, but I'm just going by what I've read. (Source<http://productforums.google.com/forum/#!topic/picasa/UsZVs63loDM> )
Apparently there are ways to test if the tool you use makes use of lossless rotation. This page lists some: http://www.impulseadventure.com/photo/lossless-rotation-test.html This page also has a nice explanation of lossless rotation and its finer nuances: http://www.betterjpeg.com/lossless-rotation.htm >From what I've learned so far, I think in the end you just have to relax about all this stuff and not worry about it too much, though it does help to know what's happening when you do certain things (such as rotate a jpeg). On Mon, May 28, 2012 at 5:31 AM, gfxuser <gfx.u...@online.de> wrote: > 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 > > ______________________________**_________________ > gimp-developer-list mailing list > gimp-developer-list@gnome.org > https://mail.gnome.org/**mailman/listinfo/gimp-**developer-list<https://mail.gnome.org/mailman/listinfo/gimp-developer-list> >
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