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How does one make bluelines of artwork with GIMP?

May 26, 2010, 02:48
Post: #1
How does one make bluelines of artwork with GIMP?
Hi. I'm new here, and I was wondering if any of you could help me question I have.

In comic book art they do a process called "bluelining," where black and white line art is converted to non-reproducible blue and printed out so it can be inked. Now, I'd like to try this process out on some line art images I have. But while there's a lot of Photoshop tutorials on how to do this, I can't find anything on how to do it in GIMP.

For the sake of comparison, here's how it's done in Photoshop (from another forum):
Quote:1. open the file in Photoshop
2. Select all and cut (command-x)
3. switch to CMYK (Image > Mode > CMYK color)
4. click on Cyan in the Channels palette (or hit command-1)
5. paste (command-v)
6. click on CMYK in the Channels palette (command-~)
7. print!

Now it's my understanding that GIMP works on the RGB setup instead of CMYK, but the principle should still be the same. It should still be possible to recolor line art from standard black to some shade of blue. How would one go about doing this in GIMP? What's the step by step process?
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Jun 2, 2010, 01:18
Post: #2
RE: How does one make bluelines of artwork with GIMP?
I hope someone helps you with this Mr. Comic Book. I can't wait to see some of your comics Smile
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Jun 2, 2010, 19:22
Post: #3
RE: How does one make bluelines of artwork with GIMP?
Ahh, somehow missed out this thread.

First of all, welcome to the forums! Smile

I would suggest you to use Gradient Map (Colors > Map > Gradient Map) filter to accomplish this. Gradient Map re-colors the active layer or selection based on the current gradient.

Instructions:
  1. Open up the file in GIMP.
  2. Set the foreground color to cyan (#00FFFF).
  3. Make sure to have the background color set to white (#FFFFFF).
  4. Make sure to have the gradient set to FG to BG (RGB). Use Ctrl+G to open the gradients dialog.
  5. Apply the gradient to the image with the Gradient Map filter (Colors > Map > Gradient Map).

That's it! Hope it helps.

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