Color Matching and Trichromatic Theory

This theory emerged over the eighteenth century which basically states that any color $L(\lambda)$ can be reproduced by mixing appropriate amounts of three primary colors with energy distributions $P_j(\lambda),\;\;(j=1,2,3)$ provided the wavelengths are far enough apart. For example, red, green, and blue. As we will see later, ``far enough apart'' means mathematically the spectral energy distributions of the three colors are linearly independent.