KCopper

Convert pencils to non reproduction blue

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How do I change the color of linework to non reproduction blue? Specifically for printing digital artwork to apply inks to and then rescan without copying the original pencil work. If this is covered somewhere please give me a link. I tried to find it before asking.

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You could try Isolate Line Art  ... then Adjustments >>> Cyanotype ?  Depending on the shade of blue you want you could play with some of the Colour Adjustment plugins to get what you need

 

There are other alternatives to Isolate Line Art.  Color Clearer is one

 

 

non-blue.png

 

I find isolating the sketch allows you to erase any scuzzy bits on the paper, giving a fresh background layer.

 

 Color Tint could be one to try but maybe other members could point you to better ways to get a truer non-repro-blue

 

non-blue-2.png

 

Edited by welshblue
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Assuming you're starting with a black-on-white drawing, here's another method.

 

Add a lower layer and fill it with the color you want to make the lines.

Set the blending mode of the upper layer (the one containing the drawing) to Screen.

Merge the layers.

 

EDIT: Changed blend mode to Screen from Additive as a result some experimenting done in response to welshblue's follow-up comment.

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:arrow-up: That works well on simple sketches but something with a lot of detail/shading  can sometimes lose some qualities

(That said, I never thought of doing it that way 😀)

 

non-rep.png

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Isolate Line Art sounds like it will do the trick I am not sure how to integrate the plug in to paint.net. I downloaded file from provided link, extracted files, selected application, opened with paint.net and selected run, then got the error message that image was not compatible with this setting. How do I load a plug in?

 

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Is Cyanotype another plug in? Now that I have Isolated the line art of the drawing I don't have the foggiest on how to get the the light blue. The sepia adjustment does what I imagine I need in the correct hue of blue.

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1 hour ago, KCopper said:

Is Cyanotype another plug in

 

Sorry.  For some reason I thought it was standard PDN fare. Cyanotype

 

 

I can't stop playing around with this (... maybe 'cos she's so darned cute 🤐)

Below was done using Cyanotype then the built in Hue/Saturation under Adjustments.  There are loads of different plugins ... single hue, hue & saturation + being just 2

http://mattw.io/pdn-plugin-index/ 

 

non-blue-3.png

 

 

 

Edited by welshblue

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9 hours ago, welshblue said:

That works well on simple sketches but something with a lot of detail/shading  can sometimes lose some qualities

 

After experimenting with it, Screen blending mode seems to work better than Additive.

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42 minutes ago, MJW said:

After experimenting with it, Screen blending mode seems to work better than Additive.

 

Story of my life, never thinking of the simpler solution 😕

 

So many ways to skin a cat with PDN.

I've always used Isolate Line Art because I'm a messy sketcher and get smudges all over the paper from using my finger to blur/shadow

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Without Plugins

1. Adjustments -> Sepia

2. Adjustments -> Hue/Saturation

 

Works because it's a grayscale image. Sepia gives it color, hue/saturation can adjust it to blue and tweak as needed.

That's it.

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Using Sepia then hue/saturation I was able to get great manipulation of color of line work. This method should work well for clean professional pencils. Coming from my own sketchbook I need to clean up the background; scanning in greyscale I get tone at the edges of my paper because of the thickness of the book and/or the quality of my scanner. Two things happened. 1, with Isolate Line Art it seems like I lose the ability to use Hue/Saturation, only lightness affects any change. Sepia does not appear to do anything either. 2, when placing my pencils over a second layer of white background I still get all the tone present at the edges of the page. I read the help on layers to get a foundation, but I am missing something about Isolate line art and/or Layers.  I am using the print preview to get an idea of final results. Ideally I want to clean up my sketches and then convert the greyscale to the light blue. Anymore thoughts?

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