public static void HslToRgb(HSL hsl, RGB rgb)
{
if (hsl.Saturation == 0.0)
{
rgb.R = rgb.G = rgb.B = (byte) (hsl.Luminance * 255.0);
}
else
{
double vH = ((double) hsl.Hue) / 360.0;
double num2 = (hsl.Luminance < 0.5) ? (hsl.Luminance * (1.0 + hsl.Saturation)) : ((hsl.Luminance + hsl.Saturation) - (hsl.Luminance * hsl.Saturation));
double num = (2.0 * hsl.Luminance) - num2;
rgb.R = (byte) (255.0 * HueToRGB(num, num2, vH + 0.33333333333333331));
rgb.G = (byte) (255.0 * HueToRGB(num, num2, vH));
rgb.B = (byte) (255.0 * HueToRGB(num, num2, vH - 0.33333333333333331));
}
}
public static void RgbToGray(RGB source, RGB dest, GrayscaleStyle style)
{
byte gray = 0x7f;
switch (style)
{
case GrayscaleStyle.BT907:
gray = GetGray(source, BT907);
break;
case GrayscaleStyle.RMY:
gray = GetGray(source, RMY);
break;
case GrayscaleStyle.Y:
gray = GetGray(source, Y);
break;
}
dest.R = dest.G = dest.B = gray;
}
public static void RgbToGray(RGB source, RGB dest)
{
RgbToGray(source, dest, GrayscaleStyle.BT907);
}
public static RGB RgbToGray(RGB source, GrayscaleStyle style)
{
RGB dest = new RGB();
RgbToGray(source, dest, style);
return dest;
}
public static RGB RgbToGray(RGB source)
{
RGB dest = new RGB();
RgbToGray(source, dest);
return dest;
}
public static RGB HslToRgb(HSL hsl)
{
RGB rgb = new RGB();
HslToRgb(hsl, rgb);
return rgb;
}
private static byte GetGray(RGB rgb, int[] coefficient)
{
return (byte) ((((rgb.R * coefficient[0]) + (rgb.G * coefficient[1])) + (rgb.B * coefficient[2])) / coefficient[3]);
}
public static void RgbToHsl(RGB rgb, HSL hsl)
{
double num = ((double) rgb.R) / 255.0;
double num2 = ((double) rgb.G) / 255.0;
double num3 = ((double) rgb.G) / 255.0;
double num4 = Math.Min(Math.Min(num, num2), num3);
double num5 = Math.Max(Math.Max(num, num2), num3);
double num6 = num5 - num4;
hsl.Luminance = (num5 + num4) / 2.0;
if (num6 == 0.0)
{
hsl.Hue = 0;
hsl.Saturation = 0.0;
}
else
{
double num10;
hsl.Saturation = (hsl.Luminance < 0.5) ? (num6 / (num5 + num4)) : (num6 / ((2.0 - num5) - num4));
double num7 = (((num5 - num) / 6.0) + (num6 / 2.0)) / num6;
double num8 = (((num5 - num2) / 6.0) + (num6 / 2.0)) / num6;
double num9 = (((num5 - num3) / 6.0) + (num6 / 2.0)) / num6;
if (num == num5)
{
num10 = num9 - num8;
}
else if (num2 == num5)
{
num10 = (0.33333333333333331 + num7) - num9;
}
else
{
num10 = (0.66666666666666663 + num8) - num7;
}
if (num10 < 0.0)
{
num10++;
}
if (num10 > 1.0)
{
num10--;
}
hsl.Hue = (int) (num10 * 360.0);
}
}
public static HSL RgbToHsl(RGB rgb)
{
HSL hsl = new HSL();
RgbToHsl(rgb, hsl);
return hsl;
}
