Picture examine?
Answers: You'll need some photo editing software to do this. The most popular program for this is Adobe Photoshop. There are other similar programs.
There are several ways to do what you want to do. The easiest and quickest would be to pall off the nouns you don't want to change the color of, after invert (or reverse) the mask. Next, you can turn down the color saturation of the print, which will make the masked-off nouns look black & white.
There are other ways to do this that are a bit more difficult, but they give better control of carving tone, contrast, etc. There's really no "right" way to do it -- it depends on how you want the final symbol to look.
google selective color, and you'll find some tutorials on how to do it.
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