public static byte[] TransformHSV(byte[] rgbBuffer)
{
byte[] hsvBuffer = new byte[rgbBuffer.Length];
// BMP header length = 54
for (int i = 54; i < rgbBuffer.Length; i += 3)
{
RGBType rgb;
rgb.B = rgbBuffer[i];
rgb.G = rgbBuffer[i + 1];
rgb.R = rgbBuffer[i + 2];
HSVType hsv = RGB_To_HSV(rgb);
HSV_Quantize(ref hsv);
rgb = HSV_To_RGB(hsv);
hsvBuffer[i] = (byte)Math.Round(rgb.B);
hsvBuffer[i + 1] = (byte)Math.Round(rgb.G);
hsvBuffer[i + 2] = (byte)Math.Round(rgb.R);
}
return(hsvBuffer);
}
static void HSV_Quantize(ref HSVType hsv)
{
//hsv.H = (float)((int)((hsv.H * 60.0) / 10.0) / 6.0);
hsv.H = (float)((int)((hsv.H * 60.0) / 20.0) / 3.0);
}
static RGBType HSV_To_RGB(HSVType hsv)
{
float h = (float)hsv.H;
float s = (float)hsv.S;
float v = (float)hsv.V;
float m, n, f;
RGBType rgb;
rgb.R = rgb.G = rgb.B = 0; // initial
int i;
if (h == -1)
{
rgb.R = rgb.G = rgb.B = v;
}
i = (int)Math.Floor(h);
f = h - i;
//if (!(i & 1))
if (i % 2 == 0)
{// if i is even
f = 1 - f;
}
m = v * (1 - s);
n = v * (1 - s * f);
switch (i)
{
case 6:
case 0:
rgb.R = v;
rgb.G = n;
rgb.B = m;
break;
case 1:
rgb.R = n;
rgb.G = v;
rgb.B = m;
break;
case 2:
rgb.R = m;
rgb.G = v;
rgb.B = n;
break;
case 3:
rgb.R = m;
rgb.G = n;
rgb.B = v;
break;
case 4:
rgb.R = n;
rgb.G = m;
rgb.B = v;
break;
case 5:
rgb.R = v;
rgb.G = m;
rgb.B = n;
break;
}
rgb.R *= 255;
rgb.G *= 255;
rgb.B *= 255;
return(rgb);
}
