Module ngx_http_image_filter_module

The ngx_http_image_filter_module module (0.7.54+) is a filter that transforms images in JPEG, GIF, PNG, and WebP formats.

This module is not built by default, it should be enabled with the --with-http_image_filter_module configuration parameter.

This module utilizes the libgd library. It is recommended to use the latest available version of the library.
The WebP format support appeared in version 1.11.6. To transform images in this format, the libgd library must be compiled with the WebP support.
image_filter

Syntax: image_filter off;image_filter test;i

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image_filter_transparency

Syntax: image_filter_transparency on|off; Default: image_filter_transparency

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image_filter_sharpen

Syntax: image_filter_sharpen percent; Default: image_filter_sharpen

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image_filter_buffer

Syntax: image_filter_buffer size; Default: image_filter_buffer 1M;

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image_filter_webp_quality

Syntax: image_filter_webp_quality quality; Default: image_filter_webp_quality

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image_filter_interlace

Syntax: image_filter_interlace on | off; Default: image_filter_interlace

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image_filter_jpeg_quality

Syntax: image_filter_jpeg_quality quality; Default: image_filter_jpeg_quality

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