public Rgb24 ToRgb24()
{
const double c00 = 0.57735;
const double c01 = 0.408248;
const double c02 = 0.707107;
const double c10 = 0.57735;
const double c11 = 0.408248;
const double c12 = -0.707107;
const double c20 = 0.57735;
const double c21 = -0.8164965;
const double c22 = 0;
double l = c00 * L + c01 * Alpha + c02 * Beta;
double m = c10 * L + c11 * Alpha + c12 * Beta;
double s = c20 * L + c21 * Alpha + c22 * Beta;
l = Math.Pow(10, l);
m = Math.Pow(10, m);
s = Math.Pow(10, s);
int r = (int)(4.4679 * l -3.5873 * m + 0.1193 * s);
int g = (int)(-1.2186 * l + 2.3809 * m - 0.1624 * s);
int b = (int)(0.0497 * l - 0.2439 * m + 1.2045 * s);
if (r < 0) r = 0; else if (r > 255) r = 255;
if (g < 0) g = 0; else if (g > 255) g = 255;
if (b < 0) b = 0; else if (b > 255) b = 255;
Rgb24 rgb = new Rgb24();
rgb.Red = (Byte)r;
rgb.Green = (Byte)g;
rgb.Blue = (Byte)b;
return rgb;
}
public static unsafe void ForEach(this UnmanagedImage<TPixel> src, TPixel* start, uint length, ActionOnPixel handler)
{
TPixel* end = start + src.Length;
while (start != end)
{
handler(start);
++start;
}
}
public unsafe void Replace(TPixel pixel, TPixel replaced)
{
TPixel* p = this.Start;
TPixel* end = p + this.Length;
while (p != end)
{
if (*p == pixel)
{
*p = replaced;
}
p++;
}
}
public void FloodFill(System.Drawing.Point location, TPixel anchorColor, TPixel replecedColor)
{
int width = this.Width;
int height = this.Height;
if (location.X < 0 || location.X >= width || location.Y < 0 || location.Y >= height) return;
if (anchorColor == replecedColor) return;
if (this[location.Y, location.X] != anchorColor) return;
Stack<System.Drawing.Point> points = new Stack<System.Drawing.Point>();
points.Push(location);
int ww = width - 1;
int hh = height - 1;
while (points.Count > 0)
{
System.Drawing.Point p = points.Pop();
this[p.Y, p.X] = replecedColor;
if (p.X > 0 && this[p.Y, p.X - 1] == anchorColor)
{
this[p.Y, p.X - 1] = replecedColor;
points.Push(new System.Drawing.Point(p.X - 1, p.Y));
}
if (p.X < ww && this[p.Y, p.X + 1] == anchorColor)
{
this[p.Y, p.X + 1] = replecedColor;
points.Push(new System.Drawing.Point(p.X + 1, p.Y));
}
if (p.Y > 0 && this[p.Y - 1, p.X] == anchorColor)
{
this[p.Y - 1, p.X] = replecedColor;
points.Push(new System.Drawing.Point(p.X, p.Y - 1));
}
if (p.Y < hh && this[p.Y + 1, p.X] == anchorColor)
{
this[p.Y + 1, p.X] = replecedColor;
points.Push(new System.Drawing.Point(p.X, p.Y + 1));
}
}
}
public unsafe void Fill(TPixel pixel)
{
TPixel* p = this.Start;
TPixel* end = p + this.Length;
while (p != end)
{
*p = pixel;
p++;
}
}
public static unsafe void ToRgb24(byte* from, Rgb24* to, int length = 1)
{
if (length < 1) return;
Byte* end = from + length;
while (from != end)
{
Byte val = *from;
to->Blue = val;
to->Green = val;
to->Red = val;
from++;
to++;
}
}
public static unsafe void ToRgb24(Argb32* from, Rgb24* to, int length = 1)
{
if (length < 1) return;
Argb32* end = from + length;
while (from != end)
{
*to = *((Rgb24*)from);
from++;
to++;
}
}
public static unsafe void ToRgb24(Lab24* from, Rgb24* to, int length=1)
{
if (length < 1) return;
// 使用 OpenCV 中的算法实现
const float coeff0 = 0.39215686274509809f;
const float coeff1 = 0.0f;
const float coeff2 = 1.0f;
const float coeff3 = (-128.0f);
const float coeff4 = 1.0f;
const float coeff5 = (-128.0f);
Lab24* end = from + length;
float x, y, z,l,a,b;
int blue, green, red;
while (from != end)
{
l = from->L * coeff0 + coeff1;
a = from->A * coeff2 + coeff3;
b = from->B * coeff4 + coeff5;
l = (l + labLShift_32f) * (1.0f / labLScale_32f);
x = (l + a * 0.002f);
z = (l - b * 0.005f);
y = l * l * l;
x = x * x * x;
z = z * z * z;
blue = (int)((x * labBx_32f + y * labBy_32f + z * labBz_32f) * 255 + 0.5);
green = (int)((x * labGx_32f + y * labGy_32f + z * labGz_32f) * 255 + 0.5);
red = (int)((x * labRx_32f + y * labRy_32f + z * labRz_32f) * 255 + 0.5);
red = red < 0 ? 0 : red > 255 ? 255 : red;
green = green < 0 ? 0 : green > 255 ? 255 : green;
blue = blue < 0 ? 0 : blue > 255 ? 255 : blue;
to->Red = (byte)red;
to->Green = (byte)green;
to->Blue = (byte)blue;
from++;
to++;
}
}
public static unsafe void ToLab24(Rgb24* from, Lab24* to, int length=1)
{
// 使用 OpenCV 中的算法实现
if (length < 1) return;
Rgb24* end = from + length;
int x, y, z;
int l, a, b;
bool flag;
while (from != end)
{
Byte red = from->Red;
Byte green = from->Green;
Byte blue = from->Blue;
x = blue * labXb + green * labXg + red * labXr;
y = blue * labYb + green * labYg + red * labYr;
z = blue * labZb + green * labZg + red * labZr;
flag = x > labT;
x = (((x) + (1 << ((lab_shift) - 1))) >> (lab_shift));
if (flag)
x = icvLabCubeRootTab[x];
else
x = (((x * labSmallScale + labSmallShift) + (1 << ((lab_shift) - 1))) >> (lab_shift));
flag = z > labT;
z = (((z) + (1 << ((lab_shift) - 1))) >> (lab_shift));
if (flag == true)
z = icvLabCubeRootTab[z];
else
z = (((z * labSmallScale + labSmallShift) + (1 << ((lab_shift) - 1))) >> (lab_shift));
flag = y > labT;
y = (((y) + (1 << ((lab_shift) - 1))) >> (lab_shift));
if (flag == true)
{
y = icvLabCubeRootTab[y];
l = (((y * labLScale - labLShift) + (1 << ((2 * lab_shift) - 1))) >> (2 * lab_shift));
}
else
{
l = (((y * labLScale2) + (1 << ((lab_shift) - 1))) >> (lab_shift));
y = (((y * labSmallScale + labSmallShift) + (1 << ((lab_shift) - 1))) >> (lab_shift));
}
a = (((500 * (x - y)) + (1 << ((lab_shift) - 1))) >> (lab_shift)) + 129;
b = (((200 * (y - z)) + (1 << ((lab_shift) - 1))) >> (lab_shift)) + 128;
l = l > 255 ? 255 : l < 0 ? 0 : l;
a = a > 255 ? 255 : a < 0 ? 0 : a;
b = b > 255 ? 255 : b < 0 ? 0 : b;
to->L = (byte)l;
to->A = (byte)a;
to->B = (byte)b;
from++;
to++;
}
}
public static unsafe void ToByte(Rgb24* from, byte* to, int length = 1)
{
if (length < 1) return;
Rgb24* end = from + length;
while (from != end)
{
*to = (Byte)(from->Blue * 0.114 + from->Green * 0.587 + from->Red * 0.299);
from++;
to++;
}
}
public static unsafe void ToArgb32(Rgb24* from, Argb32* to, int length = 1)
{
if (length < 1) return;
Rgb24* end = from + length;
while (from != end)
{
to->Blue = from->Blue;
to->Green = from->Green;
to->Red = from->Red;
to->Alpha = 255;
from++;
to++;
}
}
public static Cmyk CreateFrom(Rgb24 rgb)
{
return(CreateFrom(rgb.Red, rgb.Green, rgb.Blue));
}
public static Cmyk CreateFrom(Rgb24 rgb)
{
return CreateFrom(rgb.Red, rgb.Green, rgb.Blue);
}