/// <summary>
/// 将颜色调暗一些
/// </summary>
/// <param name="color">待修正色</param>
/// <returns>修正色</returns>
private static HslColor ReviseDarker(HslColor color)
{
return(ReviseDarker(color, ReviseParameter));
}
/// <summary>
/// 将颜色调亮特定亮度
/// </summary>
/// <param name="color">待修正色</param>
/// <param name="brigher">调整的亮度</param>
/// <returns>修正色</returns>
private static HslColor ReviseBrighter(HslColor color, double brigher)
{
return(new HslColor(color.Alpha, color.Hue, color.Saturation, color.Lightness + brigher));
//return Color.FromRgb(ReviseByteBigger(hsvColor.R), ReviseByteBigger(hsvColor.G), ReviseByteBigger(hsvColor.B));
}
/// <summary>
/// 将颜色调暗特定亮度
/// </summary>
/// <param name="color">待修正色</param>
/// <param name="darker">调整的亮度</param>
/// <returns>修正色</returns>
private static HslColor ReviseDarker(HslColor color, double darker)
{
return(new HslColor(color.Alpha, color.Hue, color.Saturation, color.Lightness - darker));
}
/// <summary>
/// 将颜色调整到能够接受的最高亮度
/// </summary>
/// <param name="color">待修正色</param>
/// <returns>修正色</returns>
private static HslColor ReviseVeryBright(HslColor color)
{
return(ReviseBrighter(color, TooBright - color.Lightness));
}
/// <summary>
/// 将颜色调整到能够接受的最低亮度
/// </summary>
/// <param name="color">待修正色</param>
/// <returns>修正色</returns>
private static HslColor ReviseVeryDark(HslColor color)
{
return(ReviseDarker(color, color.Lightness - TooDark));
}
/// <summary>
/// 颜色是否太暗
/// </summary>
/// <param name="color">颜色</param>
/// <returns>Boolean值</returns>
private static bool IsTooDark(HslColor color)
{
return(color.Lightness < TooDark);
}
/// <summary>
/// 颜色是否太亮
/// </summary>
/// <param name="color">颜色</param>
/// <returns>Boolean值</returns>
private static bool IsTooBright(HslColor color)
{
return(color.Lightness > TooBright);
}
/// <summary>
/// 颜色饱和度是否接近0
/// </summary>
/// <param name="color">颜色</param>
/// <returns>Boolean值</returns>
private static bool IsAlmostZeroSaturation(HslColor color)
{
return(color.Saturation < AlmostZeroSaturation);
}
/// <summary>
/// 颜色饱和度是否太低
/// </summary>
/// <param name="color">颜色</param>
/// <returns>Boolean值</returns>
private static bool IsNotSaturateEnough(HslColor color)
{
return(color.Saturation < NotSaturateEnough);
}
/// <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>
private static double Difference(HslColor c1, HslColor c2)
{
return(Difference(c1.ToRgb(), c2.ToRgb()));
}
/// <summary>
/// 两种颜色差异是否足够大
/// </summary>
/// <param name="c1">颜色1</param>
/// <param name="c2">颜色2</param>
/// <returns>Boolean值</returns>
private static bool IsTooMuchDiff(HslColor c1, HslColor c2)
{
return(Difference(c1, c2) > CoverColorDiff);
//return Math.Abs((c1.R - c2.R) * (c1.R - c2.R) + (c1.G - c2.G) * (c1.G - c2.G) + (c1.B - c2.B) * (c1.B - c2.B)) > CoverColorDiff;
}
/// <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>
private 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));
}
}