【C#】图片处理（底片，黑白，锐化，柔化，浮雕，雾化）

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90,180,270public 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 originalnew Point(height, width),// destination for upper-right point of originalnew 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 originalnew Point(0, height),// destination for upper-right point of originalnew 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 originalnew Point(0, 0),// destination for upper-right point of originalnew 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;}

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