Is there a paint tool that allows me to change the color of specific foreground pixels as I drag it over the picture while leaving the background color untouched?

All of my photos are created using PhotoGrav which converts them to black pixels on a white background for etching on a laser machine.

I would like to know if there is a tool similar to a brush or a pencil that will allow me to drag it over these areas (like I am drawing) converting the black pixels to a different chosen color while leaving the white background untouched.

1. Make sure the image is in RGB mode Image -> Mode -> RGB

2. Make a new layer, fill with the desired colour, place under the B/W layer.

3. Foreground colour black, paint brush mode color-erase see sceenshot

4. suitable paintbrush size, paint over the black over the black pixels.

1. Make sure the image is in RGB mode Image -> Mode -> RGB

2. Make a new layer, fill with the desired colour, place under the B/W layer.

3. Foreground colour black, paint brush mode color-erase see sceenshot

4. suitable paintbrush size, paint over the black over the black pixels.

Hate this mailing list format.

An OOPS

1A. Make sure the image has transparency, Layer -> Transparency -> Add Alpha Channel.