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10.4: About Preview and rotated/mirrored images
Well it's not a fix for Preview, but luckily there is another free way to flip backgrounds.
Install the netpbm utilities to get some really neat, powerful graphics filtering. They can be installed from http://netpbm.darwinports.com/ if you have darwin ports, or http://pdb.finkproject.org/pdb/package.php/netpbm10 if you have fink. I think I just downloaded the source - it compiled and installed cleanly from http://netpbm.sourceforge.net/ Once you have the netpbm utilities, you can do all sorts of things. To flip your background image, open a Terminal and issue a command like djpeg background.jpg | pnmflip -lr | cjpeg > flippedbackground.jpg. More on the syntax for pnmflip, which actually does the flipping, is available at http://linux.about.com/library/cmd/blcmdl1_pnmflip.htm
10.4: About Preview and rotated/mirrored images
Not near a Mac*, but if you're at the command line, try:
No need to install anything else.
Applscript has access to image manipulations too. * so this might not actually do anything with the pixels
PhotoTool CM
Try this freeware contextual menu extension that looks like it implements the sips ImageEvents in friendly GUI form.
It's positively shameful that jpeg editor apps still use lossy rotates in this day and age.
PhotoTool CM
But PhotoTool CM doesn't support Tiger :-(
10.4: About Preview and rotated/mirrored images
This will result in some quality loss due to recompression. It turns out that JPEG, even though it is a lossy format, can be rotated and flipped losslessly. I don't know whether sips uses the lossless algorithm, but if not, the jpegtran program can do it. If you have fink, do
fink install libjpeg
and then man jpegtran
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