rgb轉化到hsv的演算法:
max = max(r, g, b)
min = min(r, g, b)
if r = max, h = (g - b)/(max - min)
if g = max, h = 2 + (b - r)/(max - min)
if b = max, h = 4 + (r - g)/(max - min)
h = h * 60
if h < 0, h = h + 360
v = max(r, g, b)
s = (max - min)/max
hsv轉化到rgb的演算法
if s = 0
r = g = b = v
else
h /= 60
i = integer(h)
f = h - i
a = v * ( 1 - s )
b = v * ( 1 - s * f )
c = v * ( 1 - s * (1 - f ) )
switch(i)
case 0: r = v; g = c; b = a;
case 1: r = b; g = v; b = a;
case 2: r = a; g = v; b = c;
case 3: r = a; g = b; b = v;
case 4: r = c; g = a; b = v;
case 5: r = v; g = a; b = b;
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