[UPHPU] Lossless jpg operations

[Brandon Stout]

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I sent this message to SLLUG and have not had any responses yet.  Since
UPHPU is the best UG out there, I probably ought to have asked here
first, but I generally try to keep my questions here on web based stuff,
and this question is for a Linux-based app.

Some operations on jpg files can be done lossless-ly.  Rotating is one
of them.  I've  used gwenview for what I think is lossless jpg
operations since when I rotate images, they do not change in file size
at all when other applications, such as Gimp will change the file
size.  I've run into a problem though.  When I look at my camera
images, gwenview auto-rotates them from the exif data.  Most other
programs do not do this auto-rotation, including Gallery, which I use
to put the pictures on the web.  I'd prefer to not let gwenview rotate
the images so I can fix the file so all apps can see the picture the
right way.  However, gwenview does not seem to have a setting for it.
Actually, gwenview has almost nothing in the settings I can configure
- - at least through the gui, only background color, transparent
background, and mouse wheel behavior.  There may be a way to manually
configure it in ~/.kde4/share/config/gwenviewrc , but that still
leaves me with a problem.  If I rotate the file, the exif data may
then throw off apps that still use the exif information.  Now my question:

Is there a simple Linux tool that lets me losslessly rotate a camera
image, and change the exif 'orientation' tag - hopefully at once?

I'd like it to be in the gui, because I don't see much use in changing
from a gui, which I need to see the picture in the first place, to a
terminal to run a command, then back to a gui which would then need a
refresh.  However, if cli is the only way, I'll give it a try.

Brandon
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