This code implements a number of image processing operations using Intel’s Threading Building Blocks (TBB) library. Using the map pattern, implement a TBB kernel to convert an image, where each pixel is stored with red, green and blue components (an RGB colour space) into an image where each pixel is stored with chromaticity (x, y) and luminance (Y). First convert RGB into intermediate XYZ values: X = 0.4124 * R + 0.3576 * G + 0.1805 * B Y = 0.2126 * R + 0.7152 * G + 0.0722 * B Z = 0.0193 * R + 0.1192 * G + 0.9505 * B Second calculate xyY as: x = X / (X + Y + Z) y = Y / (X + Y + Z) Y = Y …where Y is the luminance of the given pixel. The output of this stage will be a new image where each pixel is stored in the xyY colour space instead of the RGB colour space. Second TBB kernel to take the resulting image from step 1 and set the luminance of each pixel to be 50% of its original value. Third TBB kernel to convert the xyY image you modified in step 2 back into the RGB colour space and save the resulting image to disk. First convert the xyY values back into intermediate XYZ values… X = x * (Y / y) Y = Y Z = (1- x- y) * (Y/ y) …then convert the intermediate XYZ values into RGB values: R = 3.2405 * X + -1.5371 * Y + -0.4985 * Z G = -0.9693 * X + 1.8760 * Y + 0.0416 * Z B = 0.0556 * X + -0.2040 * Y + 1.0572 * Z