/// <summary>
/// 颜色修正
/// </summary>
/// <param name="color1">待修正色</param>
/// <param name="color2">参照色</param>
/// <returns>修正色</returns>
public static HslColor Revise(HslColor color1, HslColor color2)
{
var newcolor = new HslColor(color1.ToRgb());
while (IsTooBright(newcolor) || !IsTooMuchDiff(newcolor, color2) && !IsTooDark(newcolor) && newcolor.Lightness > 0)
{
newcolor = ReviseDarker(newcolor);
}
if (!IsTooDark(newcolor))
{
return(newcolor);
}
newcolor = ReviseBrighter(color1);
while (IsTooDark(newcolor) || !IsTooMuchDiff(newcolor, color2) && !IsTooBright(newcolor) && newcolor.Lightness < 1)
{
newcolor = ReviseBrighter(newcolor);
}
if (!IsTooBright(newcolor))
{
return(newcolor);
}
if (IsTooBright(color1))
{
return(ReviseVeryBright(color1));
}
if (IsTooDark(color1))
{
return(ReviseVeryDark(color1));
}
return(color1);
}
/// <summary>
/// 反色
/// </summary>
/// <param name="color">原色</param>
/// <returns>反色</returns>
public static HslColor Reverse(HslColor color)
{
Color rgb = color.ToRgb();
return(new HslColor(Color.FromArgb(rgb.A, (byte)(255 - rgb.R), (byte)(255 - rgb.G), (byte)(255 - rgb.B))));
//return new HSLColor(hsvColor.Alpha, hsvColor.Hue + 180, 1 - hsvColor.Saturation, 1 - hsvColor.Lightness);
}
/// <summary>
/// 计算两种颜色的差异。0为无差异，1为差异最大值
/// </summary>
/// <param name="c1">颜色1</param>
/// <param name="c2">颜色2</param>
/// <returns>差异值</returns>
public static double Difference(HslColor c1, HslColor c2)
{
return(Difference(c1.ToRgb(), c2.ToRgb()));
}
/// <summary>
/// 从图片中获取指定区域的背景颜色
/// </summary>
/// <param name="pixels">The pixels.</param>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="left">The left.</param>
/// <param name="right">The right.</param>
/// <param name="top">The top.</param>
/// <param name="bottom">The bottom.</param>
/// <param name="forceDisableColorWeight">if set to <c>true</c> [force disable color weight].</param>
/// <returns></returns>
public static Color GetColorOfRegion(byte[] pixels, int width, int height, int left, int right, int top,
int bottom, bool forceDisableColorWeight = false, bool removeFaceColor = true)
{
const int bytesPerPixel = 3;
double sr = 0, sg = 0, sb = 0;
double totalweight = 0;
for (int i = top; i < bottom; i++)
{
for (int j = left; j < right; j++)
{
byte r = pixels[(i * width + j) * bytesPerPixel + 0];
byte g = pixels[(i * width + j) * bytesPerPixel + 1];
byte b = pixels[(i * width + j) * bytesPerPixel + 2];
double weight;
if (!forceDisableColorWeight && EnableColorWeight)
{
var color = Color.FromRgb(r, g, b);
var hslColor = new HslColor(color);
weight = (1 - Math.Abs(1 - 2 * hslColor.Lightness)) * hslColor.Saturation;
if (weight < MinWeight)
{
weight = 0;
}
if (removeFaceColor)
{
var difference = Math.Abs(new HslColor(FaceColor).Hue - hslColor.Hue) / 360;
if (difference <= ZeroWeightFaceColorDifference)
{
weight = 0;
}
else
{
weight = weight * difference;
}
}
}
else
{
weight = 1;
}
totalweight += weight;
sr += r * weight;
sg += g * weight;
sb += b * weight;
}
}
if (totalweight <= 0)
{
if (removeFaceColor)
{
//当去除人脸色彩后总权重为0时，禁用去除人脸色彩
return(GetColorOfRegion(pixels, width, height, left, right, top, bottom, false, false));
}
else
{
//纯灰度图片不能使用权重
var newColor = GetColorOfRegion(pixels, width, height, left, right, top, bottom, true);
var newHslColor = new HslColor(newColor);
newHslColor.Saturation = 0;
return(newHslColor.ToRgb());
}
}
else
{
sr = sr / totalweight;
sg = sg / totalweight;
sb = sb / totalweight;
return(Color.FromRgb((byte)sr, (byte)sg, (byte)sb));
}
}