Paper2D - Change sprite color to black and white

I think the question is self explanatory but i wanted to know how can you change the color of a sprite to it’s black and white part?
Should this be using the material of the sprite or using a post-process?

My main goal for this is to make the whole world black and white except for dangerous stuff and the character itself.

EDIT:
I would also like a link to the theory behind converting colors to black and white, if you know one of course.

Hey DylanVelez -

Probably the way you would want to handle this in the Sprite’s Material setup by plugging your texture into the Desaturation node for everything but your character and “dangerous” stuff. If there is a sprite which has both you can create a mask during texture creation and use that to color one section and desaturate the other.

As far as Color Theory goes, you will want to spend some time looking into Hue, Saturation, and Value (HSV)

Thank You

Eric Ketchum

As always, very useful answers and such an awesome support. Thank you very much.