3 ms·
Also, the common rgb->greyscale algorithm has a very low factor for the blue component (0.21 for r, 0.72 for g, 0.07 for b was one of the first on google)
by 0x0 12y ago
Also, the common rgb->greyscale algorithm has a very low factor for the blue component (0.21 for r, 0.72 for g, 0.07 for b was one of the first on google)