Try out imagemagick's image diff instead of the custom-built

[trotzig]

Try out imagemagick's image diff instead of the custom-built

[lencioni]

There may be other things that we should consider:

• http://huddle.github.io/Resemble.js/
• http://pdiff.sourceforge.net/
• http://jeffkreeftmeijer.com/2011/comparing-images-and-creating-image-diffs/
• https://github.com/Phrogz/context-blender

[lencioni]

I was thinking about this some more and I wonder if we would be able to use OpenCV to get better results. It looks like there is even a gem.

[lencioni]

I also found some ImageMagick image comparison documentation that might come in handy: http://www.imagemagick.org/Usage/compare/

[lencioni]

It looks like rmagick is the gem to use for ImageMagick/GraphicsMagick.

[lencioni]

After our recent improvements to our diff, I'm not sure it is worth switching to ImageMagick for this. Especially if we want to do more things with the diff data, such as outlined in #41.

What do you think, @trotzig? Should we close this issue?

[trotzig]

Yeah, let's close this. The latest improvements you've made are great, and more will come.