MozJPEG (graphics/mozjpeg) is a patched libjpeg-turbo (graphics/jpeg-turbo). It is also a valid JPEG implementation.
MozJPEG is compatible with the libjpeg API and ABI. It is intended to be a drop-in replacement for libjpeg. MozJPEG is a strict superset of libjpeg-turbo's functionality. All MozJPEG's improvements can be disabled at runtime, and in that case it behaves exactly like libjpeg-turbo.
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