问题
When a user uploads an image in my rails app imagemagick handles two transformations:
has_attached_file :photo, :styles => { :listsize => "50x50#", :articlesize => "300x300" },
a listsize (square 50x50px) image is produced. Is it possible to at this point merge this image with a standard transparent png that would make the image look more like an icon? (I have the png image, I just want to know if it's possible to render another photo style that has this default transparent png placed over the :listsize image). Thanks
回答1:
Imagemagick is an entire image processing library and thus anything is possible. Paperclip also supports post processing.
Check the Rmagick documentation http://rmagick.rubyforge.org/
And also the Paperclip documentation on post processing https://github.com/thoughtbot/paperclip
I personally would also advise you to look into carrierwave also https://github.com/jnicklas/carrierwave
来源：https://stackoverflow.com/questions/7137342/rails-3-paperclip-imagemagick-merging-two-images