B&W and slight green tone

[Geos]

(11-21-2018, 08:02 AM)Ofnuts Wrote: Colorize: https://docs.gimp.org/2.10/en/gimp-tool-colorize.html

Gradient Map: https://docs.gimp.org/2.10/en/plug-in-gradmap.html (with a black to "slight green tone" gradient)

I'm trying to apply a tone using a new layer but nothing happens. When I use the background layer I see the tone.

[PixLab]

You can't "Colorize" an empty transparent layer with this tool
instead colorize directly the layer below (your picture), or use the bucket tool or the gradient tool to "colorize" -> fill an empty layer

[StellaD09]

I’ve seen that greenish tint before when converting to B/W. What usually fixes it for me is going to Colors → Desaturate → Desaturate or using Colors → Color to Gray instead of just dropping saturation. If the tint still hangs around, a quick tweak in Colors → Color Balance (push midtones a bit toward magenta) clears it up.