Nicely done! This is not trivial work. Have spent a lot of time working with ImageMagick + lots of tweaking to try and get background removal working. Getting

Nicely done! This is not trivial work. Have spent a lot of time working with ImageMagick + lots of tweaking to try and get background removal working. Getting it working for a more rounded, universal set of images is the toughest bit but you seem to be using a tried and true method for content identification. Have you had any success applying it to images other than of drawings?