Photoshop: Ability to mark a layer as a Normal Map
For artwork and digital painting, I think it would be useful to mark a layer as a normal map, where we could add sub-layers where certain colors can be assigned. In each sub-layer, the transparency of each pixel painted on will be determined by how close the color on the normal map's corresponding pixel is to the color selected on the layer.
This feature would allow artists to easily paint shadows and highlights with texture.
Thank you for the consideration!