He Dongjian - Color Bitmap to Black-and-White Bitmap Conversion Code
He Dongjian's Algorithm for Converting Color Bitmaps to Grayscale Bitmaps with Implementation Details
He Dongjian - Color Bitmap to Black-and-White Bitmap Conversion Code
He Dongjian - Implementation of Color Bitmap Conversion to Black-and-White (Grayscale) Bitmap with Algorithm Analysis