How to find center point of a colored image?

This point is needed to draw circles on image.

Answer 1

[Walter Roberson]

Divide size() by 2.

If you want to find the center according to content, then you need to define which parts are content to be considered and which parts are to be disregarded.

Colored images often imply different densities of materials. If that is the case with your image, then you need to define the mapping between color and density if you wish to find the center of mass.