图片优化工具

pngquan

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Pngyu、ImageAlpha其实底层使用的是pngquant

使用pngquant后可以使用imageOptim再次优化

pngquant - 普通版本

pngquant-openmp - 多核支持，速度更快

pngquant-openmp

This makes pngquant faster in wall-clock time on multicore machines when one
image at a time is processed.

However, it increases total CPU time used, and thus it's not most optimal
for server-side and parallelized batch jobs which run many pngquant
instances at a time.

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