Machine Learning for OpenCV

Encoding images in RGB space

I am sure that you are already familiar with the RGB color space, which uses additive mixing of different shades of red, green, and blue to produce different composite colors. The RGB color space is useful in everyday life, because it covers a large part of the color space that the human eye can see. This is why color television sets or color computer monitors only need to care about producing mixtures of red, green, and blue light.

In OpenCV, RGB images are supported straight out-of-the-box. All you need to know, or need to be reminded of, is that color images are actually stored as BGR images in OpenCV; that is, the order of color channels is blue-green-red instead of red-green-blue. The reasons for this choice ...