Compressing Images uploaded using CarrierWave

[Karthik Kamalakannan]

Compressing strings works perfectly with lz4. But I'm having trouble compressing images.

I've uploaded the image using CarrierWave gem. Here's how I display the image:

<%= image_tag profile.avatar_url %>

But when I try to compress using: <% comp = LZ4::compress(profile.avatar) %>,
it throws this error, " undefined method `bytesize' for #AvatarUploader:0x007fa1aaec49f8 ".

I've posted this on StackOverflow but no one has gotten back to me in the past week. I'd be happy if you could help me out on this! :)