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How can I do this coloring effect?

#1
Hi. I tried posting this on Reddit but got no response. Making maps is one of my hobbies and I found this way of coloring relief that's been used in Swiss topographic maps:
Screen Shot 2018-12-07 at 9.05.25 PM.png
However, it only describes the manual process by using layers of ink, and I wanted to apply it digitally in Photoshop with a map of mine. I've tried changing the color balance of the layer to cyan, magenta, or the necessary color, but I don't think that's the right way. What do you think is the best way to apply this? If you need more info tell me. Thanks in advance for any help!
 

IamSam

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Administrator
#4
OK, see if I'm understanding you.

Original
Screen Shot 2018-12-09 at 2.54.17 PM.png

Here I used "Color Range" to make a selection of a particular shade of grey shading on the original. I used the the selection to copy that particular shade to a new layer (selection layer). Then I added a "Solid Color Fill" layer clipped to the selection layer (set to color blending mode) to add the color blue.
Screen Shot 2018-12-09 at 2.54.30 PM.png

Repeat to add the color Yellow to a new and different shade selection.
Screen Shot 2018-12-09 at 2.54.53 PM.png

Repeat to add the color Red to a new and different shade selection.
Screen Shot 2018-12-09 at 2.55.07 PM.png

Here they are combined.
Screen Shot 2018-12-09 at 2.55.20 PM.png

Screen Shot 2018-12-09 at 3.03.16 PM.png

Not sure if this is what your wanting.
 

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