Update April 24th 2014: This is quite old and might not work with the current version of paperclip.
In the last project I've worked I found myself reviewing the application again and again on Internet Explorer since suddenly some images started showing a beautiful "not-found-red-cross".
After some research I found some blogs telling that Internet Explorer doesn't support images with a CMYK color scheme (like this one).
Since I'm using Paperclip to handle the uploads to the application it wasn't difficult to find a way to solve this. That's what I did:
As you can see I define a "normalized" style which doesn't change geometry,
however it's used to apply the color scheme conversion. Since it's the default
style you can use it like
current_user.avatar.url without worrying about the