Just for fun 
IMG_3420.jpg.out.pp3 (9.9 KB)
While playing with retinex in combination with raw_Black_levels I took this …
These are in fact unpredictable retinex artifacts … or else we could call them “artistic tools” 
With the black levels I was trying to substitute the “Bias Frame Subtraction” that astrophotographers use to eliminate the light polution influence …