mozjpeg (Mozilla JPEG Encoder Project)
mozjpeg is a fork of libjpeg-turbo from Mozilla Research. Its goal is to
reduce the size of JPEG files without reducing quality or compatibility
with the vast majority of the world's deployed decoders. The idea is to
reduce transfer times for JPEGs on the Web, thus reducing page load times.
mozjpeg is not intended to be a general JPEG library replacement. It makes
tradeoffs that are intended to benefit Web use cases and focuses solely
on improving encoding. It is best used as part of a Web encoding workflow.
In essence, libjpeg-turbo (as shipped with Slackware) is optimized for
speed of encoding/decoding, while mozjpeg is optimized for encoding
smaller file sizes (at the expense of speed). mozjpeg will not interfere
with Slackware's libjpeg-turbo package, as it installs to /opt/mozjpeg/.
mozjpeg supports multiple versions of the libjpeg API. By default,
version 6b is built. If you need compatibility with libjpeg 7 or 8,
set API=7 or API=8 in the script's environment.
Optionally, mozjpeg can be built with Java wrapper support for
turbojpeg. To do this, install one of: jdk, openjdk, openjdk8, or
openjdk6. Then run this script with JAVA=yes in the environment.
To run the binaries, it's probably easiest to add this to ~/.bash_profile:
export PATH=/opt/mozjpeg/bin:$PATH
export MANPATH=/opt/mozjpeg/man:$MANPATH
To compile & link with the mozjpeg libraries, use -I/opt/mozjpeg/include
and -L/opt/mozjpeg/lib (or lib64). You might also want -static, or
else -Wl,-rpath,/opt/mozjpeg/lib (or lib64). Starting with version 3.2,
there's also pkg-config support for mozjpeg. In ~/.bash_profile:
export PKG_CONFIG_PATH=/opt/mozjpeg/lib64/pkgconfig:$PKG_CONFIG_PATH
(chage lib64 to lib, for 32-bit Slackware)
If you built with JAVA=yes, the java library will be installed
as /opt/mozjpeg/classes/turbojpeg.jar, and the docs will be in
/usr/doc/mozjpeg-$VERSION/javadoc.
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