Change color with RGB values
Any desired color is produced by blending three primary colors of light: red, green and blue, each with its own intensity. The 4 planes of the matrix in the jit.matrix object are considered the alpha, red, green, blue, planes of the color of each pixel. The planes are numbered starting from 0: alpha=0, red=1, green=2, blue=3. Normally the data in a 4-plane image matrix is of type char, representing numbers from 0 to 255.