I am trying to tint some terrain shadows (raster) with overlaying polygons of different colours (RGB). Thing is that the polygons are larger than the shadings so VectorOnRasterOverlayer colours a larger area than I wish. I only want to tint the "black/greys" in the raster, not the white areas.
I have tried to filter out the unwanted areas using a RasterExpressionEvaluator, setting everything beyond break point to white. Unfortunately I have not been able to figure out a syntax that does not also change the hues.
Any ideas on how to approach this?
Looking at the example below I would like to keep the darker/shaded areas and shift the flat ones to white.
