I have a grey floor tile with some colour texture. I want to mix all colours together so I get a single colour that I will paint my skirting board with. I intend to take a photo of the tile, mix it in gimp and when used to resulting colour to blend the paint.
I want this to mimic real paint blending. Imagine if every pixel in the image was a drop of paint, the paint colour will be all the drops mixed together.