When trying to convert a whole directory's worth of JPG files off my camera (make them smaller for easier upload to Facebook) I usually use imagemagick.
Simple code like this:
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mogrify -resize 50% *.JPG
In Fatdogs gone by, that works simply and converts every file, overwriting the original files with ones about 1/5th of the size. Perfect for online usage. However, in 901, I get the error:
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mogrify: no decode delegate for this image format `JPEG' @ error/constitute.c/ReadImage/746
Apparently the googletron tells me that I need to install libJPEG to make sure that imagemagick works, but, it is installed. Not sure how to proceed. I'm guessing something stupidly simple like a symlink from A - B and it'll go, but I'm not that bright.