how to use smusher && paperclip-smusher

Hi everyone,
I want to use one in two gems to LOSSLESS image size when using paperclip upload image to s3.
With smusher gem : https://github.com/grosser/smusher
   I don't know how to do that (run in console ok, but in ruby is error undefine method smusher)
With paperclip-smusher: https://github.com/knightq/paperclip-smusher
   I don't know how to install 2 lib required fro this gem, and when I using this gem in heroku , is this support lib for this lib???

Thank for your attention
Hope to see your answer soon!