通过GDI+对图片数据进行处理，下面列出各个效果的算法
对于读取图片的每个像素颜色的速度非常慢，这里使用LockBitmap类来对图片像素进行操作，LockBitmap类的定义看这里
http://www.cnblogs.com/bomo/archive/2013/02/26/2934055.html
1、旋转（90度，180度，270度）
//旋转90,180,270 public Bitmap RotateImage(Bitmap bmp, int angle) { if (angle != 90 && angle != 180 && angle != 270) { return null; } int width = bmp.Width; int height = bmp.Height; if (angle == 90) { Bitmap newbmp = new Bitmap(height, width); using (Graphics g = Graphics.FromImage(newbmp)) { Point[] destinationPoints = { new Point(height, 0), // destination for upper-left point of original new Point(height, width),// destination for upper-right point of original new Point(0, 0)}; // destination for lower-left point of original g.DrawImage(bmp, destinationPoints); } return newbmp; } if (angle == 180) { Bitmap newbmp = new Bitmap(width, height); using (Graphics g = Graphics.FromImage(newbmp)) { Point[] destinationPoints = { new Point(width, height), // destination for upper-left point of original new Point(0, height),// destination for upper-right point of original new Point(width, 0)}; // destination for lower-left point of original g.DrawImage(bmp, destinationPoints); } return newbmp; } if(angle == 270) { Bitmap newbmp = new Bitmap(height, width); using (Graphics g = Graphics.FromImage(newbmp)) { Point[] destinationPoints = { new Point(0, width), // destination for upper-left point of original new Point(0, 0),// destination for upper-right point of original new Point(height, width)}; // destination for lower-left point of original g.DrawImage(bmp, destinationPoints); } return newbmp; } return null; }
2、重设大小
//重设大小 public Bitmap ResizeImage(Bitmap bmp, Size size) { Bitmap newbmp = new Bitmap(size.Width, size.Height); using (Graphics g = Graphics.FromImage(newbmp)) { g.DrawImage(bmp, new Rectangle(Point.Empty, size)); } return newbmp; }
3、底片效果（反色）（255-r, 255-g, 255-b）
//底片 public 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; for (int x = 1; x < width; x++) { for (int y = 1; y < height; y++) { int r, g, b; pixel = lbmp.GetPixel(x, y); 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; }
4、黑白效果
//黑白 public Bitmap GrayImage(Bitmap bmp, int 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 0://平均值法 Result = ((r + g + b) / 3); break; case 1://最大值法 Result = r > g ? r : g; Result = Result > b ? Result : b; break; case 2://加权平均值法 Result = ((int)(0.3 * r) + (int)(0.59 * g) + (int)(0.11 * b)); break; } newlbmp.SetPixel(x, y, Color.FromArgb(Result, Result, Result)); } } lbmp.UnlockBits(); newlbmp.UnlockBits(); return newbmp; }
5、浮雕：找出附近的像素点r1，abs（r-r2+128）
//浮雕 public 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; }
6、柔化
//柔化 public 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; }
7、锐化
//锐化 public Bitmap SharpenImage(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; //拉普拉斯模板 int[] Laplacian = { -1, -1, -1, -1, 9, -1, -1, -1, -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 * Laplacian[Index]; g += pixel.G * Laplacian[Index]; b += pixel.B * Laplacian[Index]; Index++; } } //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; }
8、雾化
//雾化 public 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; }
