/// <summary>
/// 将颜色调暗一些
/// </summary>
/// <param name="color">待修正色</param>
/// <returns>修正色</returns>
public 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>
public 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>
public 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>
public 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>
public static HslColor ReviseVeryDark(HslColor color)
{
return ReviseDarker(color, color.Lightness - TooDark);
}
/// <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);
}
}
/// <summary>
/// 无参照色时的颜色修正
/// </summary>
/// <param name="color">待修正色</param>
/// <returns>修正色</returns>
public static HslColor Revise(HslColor color)
{
if (IsTooDark(color))
return ReviseBrighter(color);
if (IsTooBright(color))
return ReviseVeryBright(color);
//color = ReviseDarker(color);
//if (IsTooDark(color))
//return ReviseVeryDark(color);
return color;
}
/// <summary>
/// 颜色是否太亮
/// </summary>
/// <param name="color">颜色</param>
/// <returns>Boolean值</returns>
public static bool IsTooBright(HslColor color)
{
return color.Lightness > TooBright;
}
/// <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>
/// 颜色饱和度是否接近0
/// </summary>
/// <param name="color">颜色</param>
/// <returns>Boolean值</returns>
public static bool IsAlmostZeroSaturation(HslColor color)
{
return color.Saturation < AlmostZeroSaturation;
}
/// <summary>
/// 颜色是否太暗
/// </summary>
/// <param name="color">颜色</param>
/// <returns>Boolean值</returns>
public static bool IsTooDark(HslColor color)
{
return color.Lightness < TooDark;
}
/// <summary>
/// 颜色饱和度是否太低
/// </summary>
/// <param name="color">颜色</param>
/// <returns>Boolean值</returns>
public 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>
public 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>
public 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>
/// 转换到RGB色彩空间
/// </summary>
/// <param name="hsl">HSL颜色</param>
/// <returns>转换后的RGB颜色</returns>
public static Color ToRgb(HslColor hsl)
{
byte a = (byte)Math.Round(hsl.Alpha * 255), r, g, b;
if (hsl.Saturation == 0)
{
r = (byte)Math.Round(hsl.Lightness * 255);
g = r;
b = r;
}
else
{
double vH = hsl.Hue / 360;
double v2 = hsl.Lightness < 0.5 ? hsl.Lightness * (1 + hsl.Saturation) : (hsl.Lightness + hsl.Saturation) - (hsl.Lightness * hsl.Saturation);
double v1 = 2 * hsl.Lightness - v2;
r = (byte)Math.Round(255 * HueToRgb(v1, v2, vH + 1.0 / 3));
g = (byte)Math.Round(255 * HueToRgb(v1, v2, vH));
b = (byte)Math.Round(255 * HueToRgb(v1, v2, vH - 1.0 / 3));
}
return Color.FromArgb(a, r, g, b);
}
/// <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>
/// 由窗口背景转换为桌面歌词前景
/// </summary>
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (value is SolidColorBrush)
{
HslColor color = new HslColor(((SolidColorBrush)value).Color);
color.Alpha = 1.0;
if (color.Lightness < 0.7) color.Lightness = 0.7;
SolidColorBrush brush = new SolidColorBrush(color.ToRgb());
if (brush.CanFreeze) brush.Freeze();
return brush;
}
return value;
}
/// <summary>
/// 从图片中获取背景颜色
/// </summary>
/// <param name="bitmap">图片</param>
public static Color GetImageColorForBackground(FormatConvertedBitmap bitmap)
{
const int bytesPerPixel = 3;
if (bitmap.CanFreeze) bitmap.Freeze();
var pixels = new byte[bitmap.PixelHeight * bitmap.PixelWidth * bytesPerPixel];
bitmap.CopyPixels(pixels, bitmap.PixelWidth * bytesPerPixel, 0);
var width = bitmap.PixelWidth;
var height = bitmap.PixelHeight;
//计算颜色的均值
Color color = GetColorOfRegion(pixels, width, height, 0, width, 0, height);
var hsl = new HslColor(color);
if (IsNotSaturateEnough(hsl) && !IsAlmostZeroSaturation(hsl))
hsl.Saturation += 0.2;
return Revise(hsl).ToRgb();
}