that´s whats stefan´s scetch is doing with my objects
works fine - Thanks
It looks like the minimal values for red and blue could be a little bit higher in order to avoid the visible brightness steps when fading to the low end. Try to set min_r and min_b to 5 or even higher.
8 Bits give not enough resolution for really smooth fades within the lowest brightness area.
I played a bit arround with the values and mixed a spoon chillired to the green and blue. 
Would it be a hugh work to define the colors by names like the keywords from the palettes like
CRGB::Indigo,
CRGB::Ivory,
CRGB::Khaki,
???
Compared to the code I wrote for you that would be an entirely different concept to fade between predefined colors.
