Daniel Reetz, the founder of the DIY Book Scanner community, has recently started making videos of prototyping and shop tips. If you are tinkering with a book scanner (or any other project) in your home shop, these tips will come in handy. https://www.youtube.com/channel/UCn0gq8 ... g_8K1nfInQ
Don't know where to start, or stuck on a certain problem? Drop by and tell us about it. Feel like helping others? Start here.
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I'm not a photography expert, so maybe I'm missing something, but I'm not sure how software would reliably detect negatives. But if you know an image is a gray-scale negative, I think you could do image inversion in Gimp or Photoshop. I doubt you could do it with a command line, but if you're using Windows, you could probably write something to do most of the work with AutoHotKey or similar utilities.
We might have different understandings of the word "negate", but ImageMagick can handle all of those cases:
Making this work automatically would be a pain for Windows, but for Linux and Mac, it's quite easy to do.
Code: Select all
convert black-white.png -negate white-black.png convert upside-down.png -rotate 180 rightside-up.png convert upside-down.png -flip rightside-up.png