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repairing pdf of old book

Nov 29, 2012, 21:40
Post: #1
repairing pdf of old book
Dear All,
I like to repair books with missing pages. Often I can get digital images in tiff or PDF format, but they are often 'dirty', like the one attached.
This one seems a good example of the sort of thing I would need to work on.

I need to reconstruct the image, which I think would mean:
i) getting an image that is complete and rectangular with a bleed out of in the same colour.
ii) remove blemishes like library marks, names etc.
iii) reconstruct the decayed text as sensitively as possible.

If anyone has some step by step pointers, I'd be very grateful.
Best,
Nick


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Nov 29, 2012, 22:46
Post: #2
RE: repairing pdf of old book
The histogram of your example shows that it has been much color-reduced (scanned in 32 gray levels?). You have to start with better material (and I hope you have images with better resolution, 200PPI or more).

There are enough techniques to fill a pair of books, but they apply to specific problems, so I won't answer here right now. If you have some initial Gimp background I suggest you ask specific questions and we will try to answer them.

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Nov 30, 2012, 12:31
Post: #3
RE: repairing pdf of old book
Many thanks for this.
The pdf I am working with is of higher resolution, this is a screen grab to give a feel for the original.
My specific question would be about reconstruction of degraded text. If there is a tutorial on this I'd be most grateful.
Best,
Nick


(Nov 29, 2012 22:46)ofnuts Wrote:  The histogram of your example shows that it has been much color-reduced (scanned in 32 gray levels?). You have to start with better material (and I hope you have images with better resolution, 200PPI or more).

There are enough techniques to fill a pair of books, but they apply to specific problems, so I won't answer here right now. If you have some initial Gimp background I suggest you ask specific questions and we will try to answer them.
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Nov 30, 2012, 13:44
Post: #4
RE: repairing pdf of old book
If you have gray where you want black; then use the Levels (or Curves). You may want to make a good selection first(*) to apply these changes on the characters only.

If your black is only spotty (disconnected black pixels), try Filters/Generic/Erode to reconnect them).

But restoring old material may require several scans with different settings... you need to be dark at places to get the text, light elsewhere to avoid the stains. Working from color scans also helps (the stains are more easily identifiable)

(*) which is the subject matter for another pair of books Smile

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