/// <summary>
/// 从图片中获取背景颜色
/// </summary>
/// <param name="image">图片</param>
/// <param name="callback">计算完成后调用的委托</param>
public static void GetImageColorForBackgroundAsync(BitmapSource image, ComputeCompleteCallback callback)
{
FormatConvertedBitmap bitmap = null;
const int bytesPerPixel = 3;
byte[] pixels = null;
int width = 0;
int height = 0;
bool isFrozen = image.IsFrozen;
if (!isFrozen)
{
//由于image没有冻结，所以image不能跨线程使用，这时要在当前线程中将image转换为另一个位图
bitmap = new FormatConvertedBitmap(image, PixelFormats.Rgb24, BitmapPalettes.WebPalette, 0);
if (bitmap.CanFreeze) bitmap.Freeze();
pixels = new byte[bitmap.PixelHeight * bitmap.PixelWidth * bytesPerPixel];
bitmap.CopyPixels(pixels, bitmap.PixelWidth * bytesPerPixel, 0);
width = bitmap.PixelWidth;
height = bitmap.PixelHeight;
}
ThreadPool.QueueUserWorkItem(new WaitCallback((state) =>
{
if (isFrozen)
{
//由于image已经冻结，所以image可以跨线程使用，这时在新线程中将image转换为另一个位图
bitmap = new FormatConvertedBitmap(image, PixelFormats.Rgb24, BitmapPalettes.WebPalette, 0);
if (bitmap.CanFreeze) bitmap.Freeze();
pixels = new byte[bitmap.PixelHeight * bitmap.PixelWidth * bytesPerPixel];
bitmap.CopyPixels(pixels, bitmap.PixelWidth * bytesPerPixel, 0);
width = bitmap.PixelWidth;
height = bitmap.PixelHeight;
}
//计算颜色的均值
int sum = width * height;
int r = 0, g = 0, b = 0;
int offset = 0;
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
r += pixels[offset++];
g += pixels[offset++];
b += pixels[offset++];
}
}
r = r / sum;
g = g / sum;
b = b / sum;
Color color1 = Color.FromRgb((byte)r, (byte)g, (byte)b);
//计算图片右部的颜色均值
r = 0; g = 0; b = 0;
int jstart = (int)(width * (1 - RightSideWidth));
sum = (width - jstart) * width;
for (int i = 0; i < height; i++)
{
for (int j = jstart; j < width; j++)
{
r += pixels[(i * width + j) * bytesPerPixel + 0];
g += pixels[(i * width + j) * bytesPerPixel + 1];
b += pixels[(i * width + j) * bytesPerPixel + 2];
}
}
r = r / sum;
g = g / sum;
b = b / sum;
Color color2 = Color.FromRgb((byte)r, (byte)g, (byte)b);
//根据上面计算出来的两个颜色计算最终颜色
HSLColor hsl1 = new HSLColor(color1);
HSLColor hsl2 = new HSLColor(color2);
hsl1.Hue += 10;
if (IsNotSaturateEnough(hsl1) && !IsAlmostZeroSaturation(hsl1))
hsl1.Saturation += 0.2;
callback(Revise(hsl1, hsl2).ToRGB());
}));
}
/// <summary>
/// 将颜色调暗一些
/// </summary>
/// <param name="hsvColor">待修正色</param>
/// <returns>修正色</returns>
public static HSLColor ReviseDarker(HSLColor color)
{
return ReviseDarker(color, ReviseParameter);
}
/// <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>
private 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>
/// 将颜色调亮特定亮度
/// </summary>
/// <param name="hsvColor">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="hsvColor">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="hsvColor">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="hsvColor">待修正色</param>
/// <returns>修正色</returns>
public static HSLColor ReviseVeryDark(HSLColor color)
{
return ReviseDarker(color, color.Lightness - TooDark);
}
/// <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)
{
HSLColor 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>
/// 无参照色时的颜色修正
/// </summary>
/// <param name="hsvColor">待修正色</param>
/// <returns>修正色</returns>
public static HSLColor Revise(HSLColor color)
{
if (IsTooDark(color))
return ReviseBrighter(color);
else
{
HSLColor newcolor = ReviseDarker(color);
if (IsTooDark(newcolor))
return ReviseVeryDark(color);
else
return newcolor;
}
}
/// <summary>
/// 颜色是否太亮
/// </summary>
/// <param name="hsvColor">颜色</param>
/// <returns>Boolean值</returns>
public static bool IsTooBright(HSLColor color)
{
return color.Lightness > TooBright;
}
/// <summary>
/// 反色
/// </summary>
/// <param name="hsvColor">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>
/// 颜色是否太暗
/// </summary>
/// <param name="hsvColor">颜色</param>
/// <returns>Boolean值</returns>
public static bool IsTooDark(HSLColor color)
{
return color.Lightness < TooDark;
}
/// <summary>
/// 颜色饱和度是否接近0
/// </summary>
/// <param name="hsvColor">颜色</param>
/// <returns>Boolean值</returns>
public static bool IsAlmostZeroSaturation(HSLColor color)
{
return color.Saturation < AlmostZeroSaturation;
}
/// <summary>
/// 颜色饱和度是否太低
/// </summary>
/// <param name="hsvColor">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，4.2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)
{
double AlphaDiff = Math.Abs(c1.Alpha - c2.Alpha);
double HueDiff = Math.Min(Math.Abs(c1.Hue - c2.Hue), Math.Min(Math.Abs(c1.Hue + 360 - c2.Hue), Math.Abs(c1.Hue - c2.Hue - 360)));
double SaturationDiff = Math.Abs(c1.Saturation - c2.Saturation);
double LightnessDiff = Math.Abs(c1.Lightness - c2.Lightness);
if (AlphaDiff + SaturationDiff + LightnessDiff > CoverColorDiff)
return SaturationDiff + LightnessDiff;
else
{
return HueDiff / 150 * Math.Min(c1.Saturation, c2.Saturation) * (0.5 - Math.Max(Math.Abs(c1.Lightness - 0.5), Math.Abs(c2.Lightness - 0.5))) * 2;
}
//return (Math.Abs(c1.Alpha - c2.Alpha) + HueDiff / 150 + Math.Abs(c1.Saturation - c2.Saturation) + Math.Abs(c1.Lightness - c2.Lightness));
}
/// <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;
}