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Registered Member #79
Joined: Thu Feb 09 2006, 11:35AM
Location: Arkansas
Posts: 673
Hey guys, I've been doodling alot in class during the less, shall we say, stimulating lectures. Some of them I liked, and I was wondering if there's any way to get the lines out of some of my pictures? I've got a bunch of them, and I was hoping maybe some of you photoshop pros could help me out.
P.S. And, no, these are not traced. Chris Hooper shamed me into learning to draw freehand... Thanks buddy!
Registered Member #524
Joined: Thu Feb 15 2007, 03:28AM
Location: Sydney, Australia.
Posts: 21
Yeah with a bit of patience with the 'Clone' and 'Healing' tools you can get rid of most of the lines. Starting with 'Image' > 'Adjustments' > 'Replace Colour' function to get rid of most of the blue in the lines helps a fair bit. Here's what a couple of minutes work did (I'm sure you could get a much better result if you spend a bit more time on it).
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
If you have high resolution scans without compression artifacts you can do it in like this:
1. Scan a clean paper or replicate a bit of a paper to get a clean paper with lines. 2. Find the average colour of the paper itself. 3. Subtract that colour from the paper with the lines. 4. Add the result to each drawing to get rid of the lines.
With high quality pictures and with absolutely no rotation or movement between images the result will be good.
Registered Member #79
Joined: Thu Feb 09 2006, 11:35AM
Location: Arkansas
Posts: 673
Um, how exactly do I do that? I feel rather stupid asking that question-- I use Fireworks almost constantly. However, I tried for an hour to figure it out this afternoon, but still nothing. There's plenty of empty page on the same scans of most of them, so I think that would work well.
By the way, Duncan, that looks great. However, I was hoping for something that wasn't so invasive.
Registered Member #32
Joined: Sat Feb 04 2006, 08:58AM
Location: Australia
Posts: 549
Because the lines are a different colour and periodically spaced it would be a straightforward spectral signal processing problem.
I doubt you have the tools for that or you wouldn't be asking.
Maybe if you can get a 2D FFT program you could do it. An FFT plugin for Photoshop et al would be slick (but technically minded). Anyone have thoughts?
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
I used Photoshop to test it. It has built in functions for most of the steps.
The pictures really are far to low quality to do much sensible with them. Just to show you how bad quality the picture really is, this is what an algorithm that looks for coloured pixels sees:
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Image Editing: Removing Specific Colors
Thanks buddy!
