cwebp

The CwebpPostProcessor is a built-in post-processor that performs a number of optimizations on WEBP 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:
                cwebp: { metadata: 'none', q: 70 }
    

This configuration enables metadata stripping and sets a maximum compression factor of 70 for the resulting image binary.

Note

The default executable path is /usr/bin/cwebp. If installed elsewhere on your system, you must set the liip_imagine.cwebp.binary parameter accordingly.

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        # app/config/config.yml

parameters:
    liip_imagine.cwebp.binary: /your/custom/path/to/cwebp
    

Options

q: int: Specify the compression factor for RGB channels between 0 and 100. The default is 75.
alpha_q: int: Specify the compression factor for alpha compression between 0 and 100.
m: int: Specify the compression method to use. Possible values range from 0 to 6.
alpha_filter: string: Specify the predictive filtering method for the alpha plane. One of none, fast or best.
alpha_method: int: Specify the algorithm used for alpha compression: 0 or 1.
exact: bool: Preserve RGB values in transparent area. The default is off, to help compressibility.
metadata: array: An array of metadata to copy from the input to the output if present. Valid values: all, none, exif, icc, xmp.

Parameters

liip_imagine.cwebp.binary: string: Sets the location of the cwebp executable. Default is /usr/bin/cwebp.
liip_imagine.cwebp.tempDir: string: Sets the directory to store temporary files.
liip_imagine.cwebp.q: int: Specify the compression factor for RGB channels between 0 and 100. The default is 75.
liip_imagine.cwebp.alphaQ: int: Specify the compression factor for alpha compression between 0 and 100.
liip_imagine.cwebp.m: int: Specify the compression method to use. Possible values range from 0 to 6.
liip_imagine.cwebp.alphaFilter: string: Specify the predictive filtering method for the alpha plane. One of none, fast or best.
liip_imagine.cwebp.alphaMethod: int: Specify the algorithm used for alpha compression: 0 or 1.
liip_imagine.cwebp.exact: bool: Preserve RGB values in transparent area. The default is off, to help compressibility.
liip_imagine.cwebp.metadata: array: An array of metadata to copy from the input to the output if present. Valid values: all, none, exif, icc, xmp.

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.

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