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ImageOptim has been my best buddy, been getting very agreeable results with it. It's just for compression but end results don't seem to have the need for sharpening. Using ImageMagick this way might be best for special cases... http://imageoptim.com/

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ImageOptim is not just for compression, it is for stripping away useless metadata, color palettes and other tricks.

For optimal images, you could do something like this:

1) Resize the image (And apply the trick from this article) use the proper quality marker (anywhere between 85-95)

2) Run it through Imageoptim

If you want a commandline version of ImageOptim, I have had good results with https://github.com/toy/image_optim

ah.. right on. cheers!

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