JPEG Optim
The JpegOptimPostProcessor is a built-in post-processor that performs a number of
lossless optimizations on JPEG encoded images.
To add this post-processor to the filter set created in the thumbnail usage example use:
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# app/config/config.yml
liip_imagine:
filter_sets:
my_thumb:
filters:
thumbnail: { size: [120, 90], mode: outbound }
background: { size: [124, 94], position: center, color: '#000' }
post_processors:
jpegoptim: { strip_all: true, max: 70, progressive: true }This configuration enables metadata stripping and progressive JPEG encoding, and sets a maximum quality factor of 70 for the resulting image binary.
Note
The default executable path is /usr/bin/jpegoptim. If installed elsewhere
on your system, you must set the liip_imagine.jpegoptim.binary parameter accordingly.
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# app/config/config.yml
parameters:
liip_imagine.jpegoptim.binary: /your/custom/path/to/jpegoptimOptions
- strip_all:
bool - Removes all comments, EXIF markers, and other image metadata.
- max:
int - Sets the maximum image quality factor.
- progressive:
bool - Ensures the image uses progressive encoding.
Parameters
- liip_imagine.jpegoptim.stripAll:
bool - Removes all comments, EXIF markers, and other metadata from the image binary.
- liip_imagine.jpegoptim.max:
int - Assigns the maximum quality factor for the image binary.
- liip_imagine.jpegoptim.progressive:
bool - Ensures that progressive encoding is enabled for the image binary.
- liip_imagine.jpegoptim.binary:
string -
Sets the location of the
jpegoptimexecutable. Default is/usr/bin/jpegoptim. - liip_imagine.jpegoptim.tempDir:
string - Sets the directory to store temporary files.
Tip
The value of liip_imagine.jpegoptim.tempDir can be set to an in-memory mount point
on supported operating systems, such as /run/shm on Linux. This will decrease disk
load and may increase performance.
