How To Add Color To A Object In A Black & White Halftone Image

[Ofnuts]

If you paint over the image with a tool in Lighten only mode, then:

• The white, which is always lighter than your color, is left untouched
  
• The black, which is always darker that you color, is replaced.
  

So in effect you replace the black in your image by your color/ But keep in mind that you'll be limited by the initial half-toning:

• Since you are painting with a lighter color than the black the half-toning was computed with, you result will be lighter
  
• Dark colors may not be colored enough