I want to produce an opaque solid color with 2 opacity values of that color.
eg: 0.5 opacity black color rectangle when placed above same 0.5 opacity black color doesn't give me same result as an opaque (opacity 1) black color.
I have tried this with different range of opacity values and found something like 0.5 & 0.8 produce 0.9 opacity black color, 0.4 & 0.82 and so on.
These are not accurate values. What is the exact formula for calculating exactly opposite opacity values?