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sips...if you have 10.3 or >
there is something built into OS X 10.3 (or better) called sips. It does everything you could probably ever want to do to an image. You can also use the Image Events AppleScript abilities. Type sips -h for help on sips, or type sips -H for help on all the properties you can edit or modify with sips.
sips...if you have 10.3 or >
In particular, to do what you want to do here, do this:
Do not use sips...
Read my
post above
to understand why. Basically the image is decoded/encoded and for JPEG this causes a loss in quality.
Do not use sips...
Wow, I have very little experience with sips, I just got my first digi-cam and was reading up on diff. command line image features in OS X (Im a programmer and sys admin, I love to be able to script anything ;) ). I had no idea sips would cause a loss of quality. At first I found it hard to believe, but I wrote a simple ruby script to apply a different copyright to a specified image file 100 times. Indeed the end result was a file smaller in size, but my eye was not good enough to notice a huge quality loss. However, quality loss there was. Thank you for the heads up. |
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