Prints a list of @2x assets that have odd dimensions. Requires imagemagick and the mini_magick gem.

check_image_dimensions.rb

require 'mini_magick'
 
root_path = '/Users/zef/Dropbox/code/some_project'
local_path = 'some_project/assets'
 
path = File.join(root_path, local_path, '**.png')
 
list = []
 
Dir.glob(path).each do |file|
  name = File.basename(file)
  image = MiniMagick::Image.open(file)
 
  if name.match('@2x') && image[:dimensions].any? { |d| d.odd? }
    list << file
    puts "#{name}: #{image[:dimensions].join('x')}"
  end
end
 
puts "Found #{list.size} odd @2x images."