[ale] Digital Cameras + Gimp

[Joe Steele]

On Wednesday, August 20, 2003 10:29 PM, Sean Kilpatrick wrote:

> On Wednesday 20 August 2003 08:24 pm, Christopher Fowler wrote:
> > I've been using gimp to rotate pictures taken from a
> > digital camera.  I've noticed that if I load a picture in
> > gimp then save it with no modifications the resulting file
> > is smaller than the original.  Is something being changed?
>
> Assuming you are dealing with jpeg images, every time you
> SAVE the image the lossy compression guarantees some degradation
> of the image.  For best results, if you have made _no_ changes
> in the image, CLOSE the file *without* saving it. This will
> avoid the recompression and detail loss that occurs when the
> file is SAVED. Rotating the image constitutes a "change."

Note that if all you need to do is rotate a jpeg, then 
your best bet is to use jpegtran, which can rotate 
and flip jpegs without any loss or degradation whatsoever.

--Joe
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