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Old Book Filtering

Jan 22, 2012, 14:41
Post: #1
Heart Old Book Filtering
Hi, I'm a newbie / noob in graphic editing, and I need some help from some savvy people for the following purpose:

There are many wonderful full color scans of manuscripts and books that are hundreds of years old available on the internet. While it's great to be able to look at them, if you were to print them the way they are in grey scale it would come out like a blurr.

So, what I need to do is to separate the information, which is the ink, from the background, which is the yellowish paper.

BUT, here is the question, by only using a lightness separator, we are leaving out useful info, like the HUE, since ink ist mostly black or greyish, and background is yellowish.

Is there any way to separate the two very efficiently, so that the "paper" becomes white or invisible, so I get to print only the INK?

Is there a way to teach GIMP to look for "yellowish, light stuff" and convert that to white, and keep the "non-colored, darker stuff", and turn that to black?

Thanks a lot in advance.

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Jan 22, 2012, 14:45
Post: #2
RE: Old Book Filtering
I forgot to add, I don't know much about graphics, as I said, but I know about audio.

What I'm looking for is somehow the same thing that you do to get noise out of something. You "teach" your software what to look for by feeding some sample in which there is no music, only background noise, then you apply that custom made filter to the whole sample, and hopefully the noise would be reduced.

I'm looking for the same thing for graphics, teach what the "paper" looks like, then turn it into white, leave only the "sound", which is the info, the ink....
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