1.
http://hi.baidu.com/%D1%C2%B1%F9/blog/item/e68be78fddc23dfe513d92df.html2. 色彩饱和度计算公式
Y = 0.299 * r + 0.587 * g + 0.114 * b;U = 0.1687* r - 0.3313* g + 0.5 * b + 128;
V = 0.5 * r - 0.4187*g - 0.0813*b + 128;
Y=亮度 U=色相 V=饱和度
RGB to HSB or RGB to HSL
U = 0.1687* r - 0.3313* g + 0.5 * b + 128;
V = 0.5 * r - 0.4187*g - 0.0813*b + 128;