Currently, I use the two colors
black to visualize the degrees of severity in two variables
Y denoting two opposites. In
RGB I let black (for
X variable) vary in the range
(0,0,0) - (255,255,255)
and I let the blue (for
Y variable) vary in the range
(0,0,0) - ( 0 , 0 ,255)
I was hoping for shades of the same intensity, like grey
(100,100,100) and blue
( 0 , 0 ,100) to be perceived as having the same 'darkness' by the human eye, but unfortunately in my own perception I see that it is not the case.
My question is - do two colors exist whose corresponding shades in the above sense are perceived as equally
dark by the human eye? If so, which colors are those? PS: If at all possible, I would like to avoid colors that tend to be perceived as a shade of
I found the following image online:
Based on this, for
X variable I decided to vary in the range
(0,0,0) - (255, 0 ,255)
Y variable to vary in the range
(0,0,0) - ( 0 ,255,255)
This puts the two colors roughly into ranges of violet and ultramarine respectively. These are just to the left and just to the right of the "Blue" receptors peak, while red receptors for violet are comparable in magnitude to green receptors for ultramarine.
It is definitely a crutch, but the equality of darkness perception for the two colors did improve a lot compared to black and blue before.