Add jpegrescan support #6
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ghost
assigned 
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interested in seeing jpegrescan added in order to output progressive jpegs. what do you think? |
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Jpegrescan integrated, see ac6c585 |
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image_optim doesn't optimise jpegs as well as ImageOptim.app. After routing through each, I discovered that this gem is lacking JPEGrescan support.
After adding this, my image_optim output appears to exactly match that of the desktop app, with the example image I've been testing going from a 0.30% to 6.49% reduction.
JPEGrescan works as a layer over the top of jpegtran, and I've included it in the jpegtran worker (in the same style as http://code.google.com/p/imageoptim/source/browse/trunk/imageoptim/Workers/JpegtranWorker.m). I think this is the best way to provide support without duplicating execution of jpegtran.
More on JPEGrescan: http://news.ycombinator.com/item?id=803839