ref. : http://www.graphicsmagick.org/convert.html
examples:
1. $ gm convert file.bmp file.png
2. $ gm convert -size 800x600 file.jpg file.png
3. $ gm convert _FILENAME_ -resize 800X600 _FILENAME_
examples:
1. $ gm convert file.bmp file.png
2. $ gm convert -size 800x600 file.jpg file.png
3. $ gm convert _FILENAME_ -resize 800X600 _FILENAME_
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