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

Negative images

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Hasher
Posts: 77
Joined: 26 Sep 2009, 03:05

Negative images

Post by Hasher » 11 Feb 2012, 10:34

Hi all


I am wonder if anyone knows of software ,preferably with command line support, that detects and converts negative images . Like a file negative to a positive image. Dont need colour support.

Thanks
Paul

VIII

Re: Negative images

Post by VIII » 11 Feb 2012, 17:53

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.

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Gerard
Posts: 154
Joined: 17 Oct 2010, 07:15
Number of books owned: 0
Location: Berlin (Germany)

Re: Negative images

Post by Gerard » 11 Feb 2012, 18:11

can you post such a negative image and tell more about the situation, image magic can do such task or imagej

Anonymous2
Posts: 97
Joined: 18 Oct 2011, 16:05

Re: Negative images

Post by Anonymous2 » 14 Feb 2012, 10:59

We might have different understandings of the word "negate", but ImageMagick can handle all of those cases:

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
Making this work automatically would be a pain for Windows, but for Linux and Mac, it's quite easy to do.

Hasher
Posts: 77
Joined: 26 Sep 2009, 03:05

Re: Negative images

Post by Hasher » 15 Feb 2012, 07:59

Hi all

this is what i mean by a negative image , just want a black and white output back to positive
thx , will try imagemagick as well
Image

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