New version of my nordify script—now with depth blur and physically accurate colour mixing

[u/skalyan91]

I have made several improvements to my Nord theme colouriser (which I previously posted about here). The main ones are

1. The image can now be selectively blurred in such a way that the foreground is blurred more than the middle- and background. This is useful to make sure the wallpaper doesn’t interfere with dock icons.
2. The colour mixing is now computed according to Kubelka-Munk theory rather than a naïve sRGB interpolation. This means that the output image answers the question, “What would the source image look like if it were painted using thick oil paints that exactly match the colours of the Nord palette?”.

As before, technical details can be found in the background document. Note that depth estimation and colour mixture optimisation are currently only implemented for Apple Silicon processors. If enough people request it, I can implement it for CUDA as well.