Simple Locomotive CMS image resizing/cashing using (free) proxy service http://images.weserv.nl. Drop this file in your engine's config/initializers directory, restart your rails server and use the filter like this: {{ image_path | scaled_image_url: 'widthxheight' }} Example: {{ post.image.url | scaled_image_url: '1096x616' }}

liquid_filters.rb

module Locomotive
  module Liquid
    module Filters
      module Text

        # Create a url that will result in the given image 
        # being scaled and compressed by the specified amount
        #
        # For more info see: http://images.weserv.nl/
        #
        # url: The original image url, with or without protocol
        # options["w"]: Desired Width
        # options["h"]: Desired Height
        # options["q"]: Desired JPG image quality (0-100)
        # options["t"]: Type of scaling [fit|absolute|square]
        #
        def scaled_image_url(url, size)
          options = {}
          options[:w] ||= size.split("x").first
          options[:h] ||= size.split("x").last
          options[:q] ||= 80
          options[:url] = url.to_s.strip.sub(/^https?:\/\//i, "")
          "http://images.weserv.nl/?" + options.to_query
        end

      end

      ::Liquid::Template.register_filter(Text)

    end
  end
end