Perceptual JPEG encoder
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Guetzli is a JPEG encoder that aims for excellent compression density at high visual quality. Guetzli-generated images are typically 20-30% smaller than images of equivalent quality generated by libjpeg. Guetzli generates only sequential (nonprogressive) JPEGs due to faster decompression speeds they offer.
apt-get install libpng-dev
dnf install libpng-devel
pacman -S libpng
apk add libpng-dev
and expect the binary to be created in
.\vcpkg install libpng
. If you prefer not to do this, refer to vcpkg's documentation.
.\vcpkg integrate install
brew install guetzli
* Using Homebrew:
brew install libpng
. * Using MacPorts:
port install libpng
(You may need to use
). 4. Run the following command to build the binary in
. * If you installed using Homebrew simply use
* If you installed using MacPorts use
CFLAGS='-I/opt/local/include' LDFLAGS='-L/opt/local/lib' make
There's also a Bazel build configuration provided. If you have Bazel installed, you can also compile Guetzli by running
bazel build -c opt //:guetzli
Note: Guetzli uses a large amount of memory. You should provide 300MB of memory per 1MPix of the input image.
Note: Guetzli uses a significant amount of CPU time. You should count on using about 1 minute of CPU per 1 MPix of input image.
Note: Guetzli assumes that input is in sRGB profile with a gamma of 2.2. Guetzli will ignore any color-profile metadata in the image.
guetzli [--quality Q] [--verbose] original.png output.jpg guetzli [--quality Q] [--verbose] original.jpg output.jpg
Note that Guetzli is designed to work on high quality images. You should always prefer providing uncompressed input images (e.g. that haven't been already compressed with any JPEG encoders, including Guetzli). While it will work on other images too, results will be poorer. You can try compressing an enclosed sample high quality image.
You can pass a
parameter to set quality in units equivalent to libjpeg quality. You can also pass a
flag to see a trace of encoding attempts made.
Please note that JPEG images do not support alpha channel (transparency). If the input is a PNG with an alpha channel, it will be overlaid on black background before encoding.