On 05/30/2012 05:55 PM, Bruce wrote:
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/#%21topic/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).
The best (and fastest....) way to rotate a JPEG is to change its
orientation flag...
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