} // end of Contrast
/// <summary>
/// 按指定的色调、饱和度、亮度对图像进行调整
/// </summary>
/// <param name="b">位图流</param>
/// <param name="hue">色调[-180, 180]</param>
/// <param name="saturation">饱和度[-1, 1]</param>
/// <param name="luminance">亮度[-1, 1]</param>
/// <returns></returns>
public Bitmap AdjustHsl(Bitmap b, float hue, float saturation, float luminance)
{
if (hue < -180.0f)
{
hue = -180.0f;
}
if (hue > 180.0f)
{
hue = 180f;
}
if (saturation < -1.0f)
{
saturation = -1.0f;
}
if (saturation > 1.0f)
{
saturation = 1.0f;
}
if (luminance < -1.0f)
{
luminance = -1.0f;
}
if (luminance > 1.0f)
{
luminance = 1.0f;
}
int width = b.Width;
int height = b.Height;
Bitmap dstImage = new Bitmap(width, height, b.PixelFormat);
BitmapData data = b.LockBits(new Rectangle(0, 0, width, height),
ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
unsafe
{
byte *p = (byte *)data.Scan0;
int offset = data.Stride - width * BPP;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
HSL hsl = HSL.FromRgb(p[2], p[1], p[0]);
hsl.Hue += hue;
hsl.Saturation += saturation;
hsl.Luminance += luminance;
p[0] = hsl.GetBlue();
p[1] = hsl.GetGreen();
p[2] = hsl.GetRed();
p += BPP;
} // x
p += offset;
} // y
}
b.UnlockBits(data);
return(b);
} // end of AdjustHsl