RGB2YCbCr.py

import numpy as np
def rgb2ycbcr(rgb_color):
    """
    requires numpy
    http://www.equasys.de/colorconversion.html
    :param rgb_color: tuple(R,G,B)
    :return: tuple(Y,Cb,Cr)
    """
    if not isinstance(rgb_color, tuple):
        raise TypeError("This method only accepts color parameter as tuple!")
    base = np.matrix("16;128;128")
    factor = np.matrix("0.257 0.504 0.098; -0.148 -0.291 0.439; 0.439 -0.368 -0.071")
    rgb_input = np.matrix(rgb_color)
    result = (factor * rgb_input.T) + base
    if result.shape != (3, 1):
        raise ArithmeticError("Something went wrong while computing the matrix calculation!")
    arr = np.asarray(result)
    return [int(arr[0][0]), int(arr[1][0]), int(arr[2][0])]