gm image processing engine for sprity
npm install sprity-gm  
> Image processor for sprity that uses gm as its image processing library.
- sprity version >= 1.0
- gm which depends on GraphicsMagick or ImageMagick.
- Please refer to the installation guide.
* install GraphicsMagick or ImageMagick
* install sprity-gm
``sh`
npm install sprity sprity-gm
Install sprity-gm globally if you want to use sprity's command line interface
`sh``
npm install sprity sprity-gm -g
* png (Default)
* jpg
* gif
Other formats supported by GraphicsMagick or ImageMagick may also work.
gm-use-imagemagick: use ImageMagick instead of GraphicsMagick [Default:* false]
See sprity documentation
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