Is there a formula or method for determining the opposite color?

Question

Algorithms

Hello.
I am writing a program to work with an image.
The program takes an image and uses the k-means algorithm to find a common color (remembers the color value in rgb). And then, using a formula or method, or even some algorithm, he must determine the opposite color to this color, so that later the written text is clearly visible. What will be your assumptions?
*No need to offer any schemes, etc. I need the program to determine the color itself.
Here are examples of opposite colors:
First pair (0, 181, 68) and (250, 43, 0)

Second pair (250, 118, 0) and (2, 139, 152)

You get the idea.
You can even write your work in any language. I care about the essence.
Thanks in advance

Answer 1

To find the opposite color, you can do the following:
- convert the RGB values ​​to the HSL color model
- rotate the H value by 180 degrees (if H < 180, then add 180, if H > 180, then subtract)
- convert back to the RGB model.

Answer 2

Here is the resource: https://colorscheme.ru/
There, look at the source code for JS and that's it.

Answer 3

As soon as you say/find out what principle you called the given colors opposite, it will immediately become easy to find its implementation in the code.