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New option 'optimize=y' for utils that take a -jpegopt param, pdftocairo and pdftoppm. This corresponds to the cjpeg -optimize flag, and slightly reduces the size of the output jpeg but uses additional cpu and memory. New jpegOptimize boolean in splash/SplashBitmap WriteImgParams. New setOptimize method on goo/JpegWriter taking a boolean. Update manpages for new option.
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