Is there any graphic program that can rotate JPEG pictures 90 degree
clockwise or counter-clockwise WITHOUT changing the picture quality? It
can run under either MS Win or Linux.
I have some JPEG photos taken vertically (width < height) using my
digicam. However, my digicam stores all photos horizontally, which
makes viewing unnatural for the "vertical" photos -- I had to turn my
head sideway to view them.
[ Man, don't I wish my digicam can sense its orientation when the photos
are taken, and adjust them accordingly. :^) ]
I tried using Photo Editor on MS Win and XV on Linux to rotate the
photos to the correct orientation. However, I would like to keep the
original quality. Strangely, I found that, using either of the 2
programs, if I saved the photos using 100% quality, the file sizes grew
about 38% larger, and if I saved using 95%, they shrunk about 33%
compared to the originals.
I don't know much about JPEG format, but I assume the file size is an
indication of its quality.
Here are my questions:
1. Is it possible to rotate a JPEG picture without changing its quality
2. If so, is there a program that can rotate JPEG pictures 90 degree in
either direction WITHOUT changing the picture quality? And
preferably the program can be executed on command-line to batch
process multiple pictures.
Thanks. I appreciate your help.
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