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detailed pencil drawing to white background

Oct 9, 2014, 20:46 (This post was last modified: Oct 9, 2014 20:47 by misterroy.)
Post: #1
detailed pencil drawing to white background
My wife is an artist and she likes to work in pencil. The pencil wont scan, but it can be photographed. The background always goes grey. She wants to maintain the detail she can achieve with the pencil, but loose the grey. I have managed before, but it is very hit ans miss as I do not know what I am doing. She draws in pencil, takes a photo in daylight, then I am handed the image to lighten.
Can I have some pointers?
Thanks.
A typical image is below:


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Oct 10, 2014, 06:40
Post: #2
RE: detailed pencil drawing to white background
Thankyou, that has to be about the most useful reply I have had on a forum. I have access to an A3 scanner at work and it does a great job of everything except pencil. The detail from the drawing is lost.
thanks again.
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Oct 10, 2014, 09:11 (This post was last modified: Oct 10, 2014 11:49 by rich2005.)
Post: #3
RE: detailed pencil drawing to white background
Another way.

You can get a result reasonably easily but you will need an extra plugin G'mic
http://gmic.sourceforge.net/

First some preparation.
1. Convert the mode from RGB to Grayscale http://i.imgur.com/MuhReLZ.jpg
2. Enhance the lines Filters -> Generic -> Erode http://i.imgur.com/lAYzudV.jpg

Then with G'mic
3. Using Repair -> Repair scanned documents. Play with the settings, I increased black level to 50 http://i.imgur.com/m59Wfyf.jpg

4. Gives this. http://i.imgur.com/FbXRqhn.jpg Up to you to repair the edges. Some detail is lost but probably as good as you might get.

edit: another "by rote" possibility

Still a little pre-processing Filter -> Generic -> Erode to firm up the lines

then this script whitebalance.scm http://registry.gimp.org/node/72 using a dark gray foreground colour picked off the image.

One side still has a cast and the edges are to fix, otherwise very straightforward.

screenshot http://i.imgur.com/zGLeaqn.jpg

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