**Color spaces and channels**Like in the world of mathematics, we have different coordinate system: for example, a 2-D cartesian plane and 2-D polar coordinates. A point could be stored as (*x*, *y*) or (r, theta). Each coordinate system has a specific use case, which makes calculations easier. Similarly, in the world of image processing, we have different color spaces. An image can store its color values in the form of Red, Blue, Green (RGB) or it could as Cyan, Magenta, Yellow, Key(black) (CMYK). Some examples of other color spaces are HSV, HSL, CMY, and it goes on. Each value in the color space is called a color channel. For example, in the RGB color space we say that Red, Blue, and Green each are channels of the ...