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Hello,

I have a .png of a floor plan which I need to darken the walls etc. I've tried couple things without luck so I'm looking for sugesstions. The picture is attached.

Thanks for any support on this.

Many solutions, on of them : use curves (Colours / Curves) - First : Colours / Desaturate / Desaturate (because the drawing contains color disturbtion)
[attachment=9788]