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Remove color pencil from b/w illustration

Jul 23, 2011, 11:10 (This post was last modified: Jul 23, 2011 11:23 by ofnuts.)
Post: #16
RE: Remove color pencil from b/w illustration
This one is nice and simple. He not using LM for the same final purpose, but this is still making an image from two layers, and choosing which layer contributes to the final image.

http://puteraaladin.blogspot.com/2008/08...p-for.html

Of course he is using black and white so it never "blends" the layers. Here what happend when you have grays in the later mask: the final image goes progressively from the color version to the B&W version:

[attachment=556]

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Jul 25, 2011, 16:25
Post: #17
RE: Remove color pencil from b/w illustration
Thanks ofnuts.

Now I'm having an issue with the bucket tool.

When manually cleaning, I fill with red to better catch areas that need fixing, but when I fill back with white or use color exchange to go from red to white, it leaves a sprinkling of red all over the place.
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Jul 25, 2011, 17:42
Post: #18
RE: Remove color pencil from b/w illustration
Because your background is not uniform. If you use "fill similar colors" in bucket-fill, you can set a threshold to tell it what to consider similar colors. But I strongly suspect that this threshold is the same as the one use by the magic wand, in other words, magic-wand with a bucket-fill of the resulting selection will give the same results as a bucket-fill of 'similar colors' using the sale threshold.

Considering that there is nothing of importance in your drawing, you should be able to use the curves or levels tools to transform everything above some value (around 200, I would say) into pure white.

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Jul 25, 2011, 18:09 (This post was last modified: Jul 25, 2011 18:10 by lontarm.)
Post: #19
RE: Remove color pencil from b/w illustration
(Jul 25, 2011 17:42)ofnuts Wrote:  you can set a threshold to tell it what to consider similar colors.

Ok so I'm somewhat confused by this. Whatever criteria it uses to decide whether to color an area shouldn't matter. Once it's colored, it's red (right?). And when I change red to white, why would there be any red left over since it should all be the same red?

I guess I'm just used to the superior way Paint works Big Grin

(Jul 25, 2011 17:42)ofnuts Wrote:  Considering that there is nothing of importance in your drawing, you should be able to use the curves or levels tools to transform everything above some value (around 200, I would say) into pure white.

I guess I really don't understand those tools. No matter how I drag around the curve or the little triangles, the red areas stay red (unless they turn black). (I do set the channel to red right?)
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Jul 25, 2011, 19:04
Post: #20
RE: Remove color pencil from b/w illustration
Post the result picture so I can see what it looks like (before/after bucket fill)

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Jul 25, 2011, 20:22
Post: #21
RE: Remove color pencil from b/w illustration
http://hotfile.com/dl/125001066/44ffe68/...f.bz2.html

I put the before / after red fill / after white fill as separate layers.
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Jul 25, 2011, 23:39
Post: #22
RE: Remove color pencil from b/w illustration
Not surprised... you have plenty of not-so-white spots in the original drawing and filling with red and then with white does nothing to clear up things. "White" isn't a color and it doesn't behave exactly like the others for fills. Some of the grey spots (or more accurately some of the spots of the grey-red soup) are even preventing the fill to propagate.

If you are searching for spots, try the technique I show in this thread:
http://gimpforums.com/thread-colour-to-a...ite-pixels (post dated Jul 20, 2011, 22:31)

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Jul 26, 2011, 00:33 (This post was last modified: Jul 26, 2011 00:35 by lontarm.)
Post: #23
RE: Remove color pencil from b/w illustration
(Jul 25, 2011 23:39)ofnuts Wrote:  filling with red and then with white does nothing to clear up things.

Just to be clear, I'm not expecting the fills by themselves to clear anything up, I just expect the one fill to 'undo' / invert the previous fill.

In Paint if you fill with one color and then fill with the original color you get back to exactly where you started (in most cases).

(Jul 25, 2011 23:39)ofnuts Wrote:  "White" isn't a color and it doesn't behave exactly like the others for fills.

That's not the (complete) issue because I can fill the red with green (instead of white) and I still have those same red spots left over.

edit: oh, unless you're talking about white/gray in the pixels and not the fill color itself . . .

(Jul 25, 2011 23:39)ofnuts Wrote:  If you are searching for spots, try the technique I show in this thread:
http://gimpforums.com/thread-colour-to-a...ite-pixels (post dated Jul 20, 2011, 22:31)

Ok, will give this a try
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