lib/image_optim/worker/optipng.rb in image_optim-0.21.0 vs lib/image_optim/worker/optipng.rb in image_optim-0.22.0

@@ -35,10 +35,12 @@
           -quiet
           --
           #{dst}
         ]
         args.unshift "-i#{interlace ? 1 : 0}" unless interlace.nil?
-        args.unshift '-strip', 'all' if strip
+        if resolve_bin!(:optipng).version >= '0.7'
+          args.unshift '-strip', 'all' if strip
+        end
         execute(:optipng, *args) && optimized?(src, dst)
       end
     end
   end
 end