- pix-bilateralprocedure
- in - PPIX
- in - SPATIAL - stddev of gaussian kernel, pixels, >0.5
- in - RANGE - stddev of gaussian range kernel, >5.0, typically 50.0
- in - NCOMPS - intermediate sums, 4..30
- in - REDUCTION - 1, 2, 4
- returns: modified ppix or #f if error.