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Presets
imgproxy preset is a named set of processing options. Presets can be used in advanced URL format to get shorter and somewhat readable URLs.
Presets definition
The preset definition looks like this:
%preset_name=%processing_options
Processing options should be defined in the same way as you define them in the advanced URL format. For example, here is a preset named awesome that sets the resizing type to fill and resulting format to jpg:
awesome=resizing_type:fill/format:jpg
Read how to specify your presets with imgproxy in the Configuration guide.
Default preset
A preset named default will be applied to each image. Useful in case you want your default processing options to be different from the imgproxy default ones.
Only presets
Setting IMGPROXY_ONLY_PRESETS as true switches imgproxy into "presets-only mode". In this mode imgproxy accepts presets list as processing options just like you'd specify them for the preset option:
http://imgproxy.example.com/unsafe/thumbnail:blurry:watermarked/plain/http://example.com/images/curiosity.jpg@png
All othe URL formats are disabled in this mode.