| کانال طراحی و رابط‌کاربری |: post #127 — TG.ME

def luminance(r, g, b):
    c = [v / 255 for v in (r, g, b)]
    adj = [v / 12.92 if v <= 0.03928 else ((v + 0.055) / 1.055) ** 2.4 for v in c]
    return 0.2126 * adj[0] + 0.7152 * adj[1] + 0.0722 * adj[2]

def contrast_ratio(c1, c2):
    L1 = luminance(*c1)
    L2 = luminance(*c2)
    L1, L2 = max(L1, L2), min(L1, L2)
    return (L1 + 0.05) / (L2 + 0.05)