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Invert Channel - Coloring Line Art

Feb 15, 2012, 13:44
Post: #1
Invert Channel - Coloring Line Art
I have a question and it's pretty much the one thing that's keeping me from using Gimp full time.

I don't do a lot of digital coloring or painting but when I do it's very comic book style. I have a method I use (you hay have seen it at polykarbon.com.)

This is how it works. Get some good clean line art in RGB mode.

In Channels, duplicate the blue layer and INVERT it.

Go back to the Layer fill the whole image with white. Then create two new layers above the background layer.

On the top layer, go to Select and pick Load Selection. Pick Blue Copy. You see the marching ants.

Fill this selection with black. Now you have a layer of your line art, a middle layer on which you can color without messing them up, and then a background.

I haven't been able to do this in Gimp. I'm willing to learn a new coloring method but I really like this one. It's easy and fast and really allows for a lot of customization. You can color the lines, do masks, etc.

My problem is the part about INVERTING the channel. Thanks for any tips.
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Feb 15, 2012, 13:55
Post: #2
RE: Invert Channel - Coloring Line Art
Nevermind, I found it a way to do it.

Layer > Transparency > Color to Alpha is exactly what I need.

Carry on. Smile
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Feb 15, 2012, 13:58
Post: #3
RE: Invert Channel - Coloring Line Art
- Open Channels list. R, G, B, channels ought to all selected (blue highlight)
- Deselect Red & Green by clicking on them
- "Colors/Invert"
- Reselect R/G

However this works on the channels for the composite/visible image.

You can also drag the Blue channel and drop it lower in the list. This will create a copy, that you can invert as above: click to select, then "Colors/Invert".

Advice: when you do this, your "active drawable" is the channel and not a layer, so before working on layers, make sure you have an active layer.

Now answering your questions on
https://Gimp-Forum.net
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