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It fails miserably on my chalkboard photo test (it doesn't claim to support chalkboard, but it seems like it should - it probably doesn't take much to determine the background is all dark and run the appropriate scripts)

Your 4 step instructions have doodle@, but the actual mailto: is for wb@. It's a minor thing, but you should be consistent.

Cool idea. I think you could run pretty far with a posterous style lazy signup and more options (like the dropbox idea, some storage, etc.) Maybe support group emails, so dev@ when sent from my email address returns a response to a certain 5 people.

Yeah, right now the algorithm subtracts out smooth areas, leaving sharply defined areas mostly alone. I could look into handling blackboard drawings if there is enough interest. Good point about the consistency with the email, I'll have to make them the same. Thanks for the feedback and the ideas, thanks!

My source (chalkboard) image wasn't great (dark, low contrast), but I got better results from the service by doing an "invert" before sending it on.

Awesome! Would you be willing to share a chalkboard pic? I don't have access to one...thanks for the invert tip!

You know this already, but I sent them to your email as in your HN profile.

I have no idea how important blackboard is - probably less so for the business world, but plenty of students use/encounter them.

If it's easy to work out a algorithm that cleans up the blackboard but harder to work out detecting the blackboard, your idea of two email addresses (doodle/wb@, and blackboard/bb@) would probably be a good solution.

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