Implement a program to generate a color histogram for each input image, and compute a color histogram difference between two input images.

Input : The following values from keyboard. 1)First input image file name (square size, and .ppm format). 2) Second input image file name (square size - same size as the first image, and .ppm format). 3) Histogram size (2(2x2x2), 4(4x4x4), 8(8x8x8), or 16(16x16x16)). Output : The followings need to be displayed in the screen as output. 1)Histogram difference in term of number of pixels. 2) Histogram difference ratio in which Histogram difference in term of number of pixels is divided by the total number of pixels in two input images.