apply a screen with color from gradiant according to value

[jacques_duflos]

Hi there,
I would like to apply a filter to a b&w image to color it. It has mostly light grey from the paper texture, and dark grey from the ink. I would like to apply different color to those pixels. I thought it would be very straight forward with some color tool, but after trying I can't find the way. Any idea ?

A visual explanation of what I want :
   
   

[Ofnuts]

Looks like Color >  Map > Gradient Map . But you are showing applying a dark green and getting very lightly tinted pixels, so there is maybe more to it.

Another solution is to use a luminosity mask and use a bucket-fill on a new layer using the positive and negative mask as selections, and then apply the resulting layer with some blend mode and opacity over the original layer.