/// <summary>
/// 看起來像底片負片的效果
/// </summary>
/// <param name="bmp"></param>
/// <returns></returns>
public static Bitmap NegativeImage(Bitmap bmp)
{
int height = bmp.Height;
int width = bmp.Width;
Bitmap newbmp = new Bitmap(width, height);
LockBitmap lbmp = new LockBitmap(bmp);
LockBitmap newlbmp = new LockBitmap(newbmp);
lbmp.LockBits();
newlbmp.LockBits();
Color pixel;
// Assumes alpha is in the rightmost byte, change as needed
for (int x = 1; x < width; x++)
{
for (int y = 1; y < height; y++)
{
int r, g, b;
pixel = lbmp.GetPixel(x, y);
//newlbmp.SetPixel(x, y, Color.FromArgb((int) (0xFFFFFF00u ^ pixel.ToArgb())));
r = 255 - pixel.R;
g = 255 - pixel.G;
b = 255 - pixel.B;
newlbmp.SetPixel(x, y, Color.FromArgb(r, g, b));
}
}
lbmp.UnlockBits();
newlbmp.UnlockBits();
return(newbmp);
}
/// <summary>
/// 浮雕
/// 找附近像赤 r1, abs(r-r2+128)
/// </summary>
/// <param name="bmp"></param>
/// <returns></returns>
public static Bitmap EmbossmentImage(Bitmap bmp)
{
int height = bmp.Height;
int width = bmp.Width;
Bitmap newbmp = new Bitmap(width, height);
LockBitmap lbmp = new LockBitmap(bmp);
LockBitmap newlbmp = new LockBitmap(newbmp);
lbmp.LockBits();
newlbmp.LockBits();
Color pixel1, pixel2;
for (int x = 0; x < width - 1; x++)
{
for (int y = 0; y < height - 1; y++)
{
int r = 0, g = 0, b = 0;
pixel1 = lbmp.GetPixel(x, y);
pixel2 = lbmp.GetPixel(x + 1, y + 1);
r = Math.Abs(pixel1.R - pixel2.R + 128);
g = Math.Abs(pixel1.G - pixel2.G + 128);
b = Math.Abs(pixel1.B - pixel2.B + 128);
if (r > 255)
{
r = 255;
}
if (r < 0)
{
r = 0;
}
if (g > 255)
{
g = 255;
}
if (g < 0)
{
g = 0;
}
if (b > 255)
{
b = 255;
}
if (b < 0)
{
b = 0;
}
newlbmp.SetPixel(x, y, Color.FromArgb(r, g, b));
}
}
lbmp.UnlockBits();
newlbmp.UnlockBits();
return(newbmp);
}
//柔化
public static Bitmap SoftenImage(Bitmap bmp)
{
int height = bmp.Height;
int width = bmp.Width;
Bitmap newbmp = new Bitmap(width, height);
LockBitmap lbmp = new LockBitmap(bmp);
LockBitmap newlbmp = new LockBitmap(newbmp);
lbmp.LockBits();
newlbmp.LockBits();
Color pixel;
//高斯模板
int[] Gauss = { 1, 2, 1, 2, 4, 2, 1, 2, 1 };
for (int x = 1; x < width - 1; x++)
{
for (int y = 1; y < height - 1; y++)
{
int r = 0, g = 0, b = 0;
int Index = 0;
for (int col = -1; col <= 1; col++)
{
for (int row = -1; row <= 1; row++)
{
pixel = lbmp.GetPixel(x + row, y + col);
r += pixel.R * Gauss[Index];
g += pixel.G * Gauss[Index];
b += pixel.B * Gauss[Index];
Index++;
}
}
r /= 16;
g /= 16;
b /= 16;
//处理颜色值溢出
r = r > 255 ? 255 : r;
r = r < 0 ? 0 : r;
g = g > 255 ? 255 : g;
g = g < 0 ? 0 : g;
b = b > 255 ? 255 : b;
b = b < 0 ? 0 : b;
newlbmp.SetPixel(x - 1, y - 1, Color.FromArgb(r, g, b));
}
}
lbmp.UnlockBits();
newlbmp.UnlockBits();
return(newbmp);
}
/// <summary>
/// 灰階
/// </summary>
/// <param name="bmp"></param>
/// <param name="type"></param>
/// <returns></returns>
public static Bitmap GrayImage(Bitmap bmp, GrayAlgorithmTypes type)
{
int height = bmp.Height;
int width = bmp.Width;
Bitmap newbmp = new Bitmap(width, height);
LockBitmap lbmp = new LockBitmap(bmp);
LockBitmap newlbmp = new LockBitmap(newbmp);
lbmp.LockBits();
newlbmp.LockBits();
Color pixel;
for (int x = 0; x < width; x++)
{
for (int y = 0; y < height; y++)
{
pixel = lbmp.GetPixel(x, y);
int r, g, b, Result = 0;
r = pixel.R;
g = pixel.G;
b = pixel.B;
switch (type)
{
case GrayAlgorithmTypes.Average: //平均值
Result = ((r + g + b) / 3);
break;
case GrayAlgorithmTypes.Maximum: //最大值
Result = r > g ? r : g;
Result = Result > b ? Result : b;
break;
case GrayAlgorithmTypes.WeightedAverage: //加權平均值
Result = ((int)(0.299 * r) + (int)(0.587 * g) + (int)(0.114 * b));
break;
}
newlbmp.SetPixel(x, y, Color.FromArgb(Result, Result, Result));
}
}
lbmp.UnlockBits();
newlbmp.UnlockBits();
return(newbmp);
}
//雾化
public static Bitmap AtomizationImage(Bitmap bmp)
{
int height = bmp.Height;
int width = bmp.Width;
Bitmap newbmp = new Bitmap(width, height);
LockBitmap lbmp = new LockBitmap(bmp);
LockBitmap newlbmp = new LockBitmap(newbmp);
lbmp.LockBits();
newlbmp.LockBits();
System.Random MyRandom = new Random();
Color pixel;
for (int x = 1; x < width - 1; x++)
{
for (int y = 1; y < height - 1; y++)
{
int k = MyRandom.Next(123456);
//像素块大小
int dx = x + k % 19;
int dy = y + k % 19;
if (dx >= width)
{
dx = width - 1;
}
if (dy >= height)
{
dy = height - 1;
}
pixel = lbmp.GetPixel(dx, dy);
newlbmp.SetPixel(x, y, pixel);
}
}
lbmp.UnlockBits();
newlbmp.UnlockBits();
return(newbmp);
}
