Whew! I've saved 15 GB of disk space by converting old .bmp SL photos to .png, and I haven't even gotten through all of them yet!
How to do it? I used Image Magick (in particular the "convert" program) to do the conversion, iterating over the images. I was not smart; I didn't use touch to preserve the time stamp, but I have a backup that I can use for that purpose.
png compresses, and unlike JPEG doesn't use lossy compression, so there's nothing to lose save maybe an excuse to get a bigger hard drive. :)
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