We can represent this image as \(3\times 3\) matrix where each entry is a colour. Colours can be represented in many ways: HEX, RGB, HSL, CYMK. We'll represent a colour by a 3D vector of RGB values.

If \(A\) is a \(3\times 3\) matrix then we can apply a linear ... This is typically what you see in historic photos. We can convert a colour image to sepia as follows. The sepia values of a pixel with ...