I wanted to validate a thought on blending of colours digitally.
Imagine I have two colours, $C_1$ $(R_1,G_1,B_1)$ and $C_2$ $(R_2,G_2,B_2)$. Now, I create colour $C3$ as follows: $C_3 = \alpha C_1 + (1-\alpha) C_2$
Where $\alpha$ is a value between $0$ and $1$. So, yes, basically, I am trying to put one object over another with a transparency associated with it.
What I want to understand is that, if I have $C_3$, $\alpha$ and $C_1$ in the above equation, will I get an accurate value of $C_2$?
Math suggests that I should, but I just want to confirm that I am not missing anything. Also, can I keep a really high but $< 1$ value for $\alpha$ and still accurately get $C_2$?