For a few years now, I've had this Photoshop process for cleaning up sketches. I've tried to describe this process before, but it's still a long, manual, convoluted process. This year, I decided it was just too tedious and there had to be a better way.

So, leading up to (and during, and following) this year's FC, I've been working on a web application that automates this sketch cleanup process as much as possible. It's now done! The batch of sketches from FC2015 in my scraps folder were all processed by this tool.

So here it is:
http://nanimoose.furryhome.com/sketchcleaner/
(Demo image NSFW due to exposed moose tits)
(Also this works best with an up-to-date desktop version of Chrome)

It operates in four steps:
1. Upload: Drag and drop an image file to be processed
2. Perspective: Tools to compensate for camera angle distortion
3. Crop: Trim away extraneous area
4. Clean: Identify points in the image where plain white paper can be seen; the app then uses this to extract the linework from the paper.

There's more detailed instructions and a sample image to play around with there at the site. Let me know if any artists out there find this thing useful!