Testing

[ghost]

Changes

Removed ImageMagik and replaced it with pure libpng code.

Issues

• Only supports PNGs with 4 channels (RGBA) meaning it fails on some images
• Converts 16 bit colour images to 8 bit colour when reading.

[rossy]

This is great. I've been planning on doing this for a while. I might pull it to a separate branch though, as I still want to clean up a lot of my code before it goes in.

As for the issues, libpng's high level API should be able to automatically convert non-RGBA images to the right format. I'll take a look at this.

[ghost]

That's fair, feel free to put it into a separate branch.

[solarkennedy]

I too was looking at how to replace the IM dependency (it doesn't compile on Ubuntu Wily)
I pulled this branch and ran a comparison, the results are not the same between the old and new, and I think the old looks better. (probably due to the issues noted already in the PR) Here were my results:
https://gist.github.com/solarkennedy/2544a9fe9ff4d76bedbc

I used the same methodology as http://www.xkyle.com/a-comparison-of-image-to-ascii-conversion-tools/