Net Core教程
【C#】图片处理（底片，黑白，锐化，柔化，浮雕，雾化）
本文主要是介绍【C#】图片处理（底片，黑白，锐化，柔化，浮雕，雾化），对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！
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）
1 //旋转90,180,270
2 public Bitmap RotateImage(Bitmap bmp, int angle)
3 {
4 if (angle != 90 && angle != 180 && angle != 270)
5 {
6 return null;
7 }
8 int width = bmp.Width;
9 int height = bmp.Height;
10
11 if (angle == 90)
12 {
13 Bitmap newbmp = new Bitmap(height, width);
14 using (Graphics g = Graphics.FromImage(newbmp))
15 {
16 Point[] destinationPoints = {
17 new Point(height, 0), // destination for upper-left point of original
18 new Point(height, width),// destination for upper-right point of original
19 new Point(0, 0)}; // destination for lower-left point of original
20 g.DrawImage(bmp, destinationPoints);
21 }
22 return newbmp;
23 }
24
25 if (angle == 180)
26 {
27 Bitmap newbmp = new Bitmap(width, height);
28 using (Graphics g = Graphics.FromImage(newbmp))
29 {
30 Point[] destinationPoints = {
31 new Point(width, height), // destination for upper-left point of original
32 new Point(0, height),// destination for upper-right point of original
33 new Point(width, 0)}; // destination for lower-left point of original
34 g.DrawImage(bmp, destinationPoints);
35 }
36 return newbmp;
37 }
38
39 if(angle == 270)
40 {
41 Bitmap newbmp = new Bitmap(height, width);
42 using (Graphics g = Graphics.FromImage(newbmp))
43 {
44 Point[] destinationPoints = {
45 new Point(0, width), // destination for upper-left point of original
46 new Point(0, 0),// destination for upper-right point of original
47 new Point(height, width)}; // destination for lower-left point of original
48 g.DrawImage(bmp, destinationPoints);
49 }
50 return newbmp;
51 }
52 return null;
53 }
旋转代码
2、重设大小
重设大小
3、底片效果（反色）（255-r, 255-g, 255-b）
1 //底片
2 public Bitmap NegativeImage(Bitmap bmp)
3 {
4 int height = bmp.Height;
5 int width = bmp.Width;
6 Bitmap newbmp = new Bitmap(width, height);
7
8 LockBitmap lbmp = new LockBitmap(bmp);
9 LockBitmap newlbmp = new LockBitmap(newbmp);
10 lbmp.LockBits();
11 newlbmp.LockBits();
12
13 Color pixel;
14 for (int x = 1; x < width; x++)
15 {
16 for (int y = 1; y < height; y++)
17 {
18 int r, g, b;
19 pixel = lbmp.GetPixel(x, y);
20 r = 255 - pixel.R;
21 g = 255 - pixel.G;
22 b = 255 - pixel.B;
23 newlbmp.SetPixel(x, y, Color.FromArgb(r, g, b));
24 }
25 }
26 lbmp.UnlockBits();
27 newlbmp.UnlockBits();
28 return newbmp;
29 }
反色效果
4、黑白效果
1 //黑白
2 public Bitmap GrayImage(Bitmap bmp, int type)
3 {
4 int height = bmp.Height;
5 int width = bmp.Width;
6 Bitmap newbmp = new Bitmap(width, height);
7
8 LockBitmap lbmp = new LockBitmap(bmp);
9 LockBitmap newlbmp = new LockBitmap(newbmp);
10 lbmp.LockBits();
11 newlbmp.LockBits();
12
13 Color pixel;
14 for (int x = 0; x < width; x++)
15 {
16 for (int y = 0; y < height; y++)
17 {
18 pixel = lbmp.GetPixel(x, y);
19 int r, g, b, Result = 0;
20 r = pixel.R;
21 g = pixel.G;
22 b = pixel.B;
23 switch (type)
24 {
25 case 0://平均值法
26 Result = ((r + g + b) / 3);
27 break;
28 case 1://最大值法
29 Result = r > g ? r : g;
30 Result = Result > b ? Result : b;
31 break;
32 case 2://加权平均值法
33 Result = ((int)(0.3 * r) + (int)(0.59 * g) + (int)(0.11 * b));
34 break;
35 }
36 newlbmp.SetPixel(x, y, Color.FromArgb(Result, Result, Result));
37 }
38 }
39 lbmp.UnlockBits();
40 newlbmp.UnlockBits();
41 return newbmp;
42 }
黑白效果
5、浮雕：找出附近的像素点r1，abs（r-r2+128）
1 //浮雕
2 public Bitmap EmbossmentImage(Bitmap bmp)
3 {
4 int height = bmp.Height;
5 int width = bmp.Width;
6 Bitmap newbmp = new Bitmap(width, height);
7
8 LockBitmap lbmp = new LockBitmap(bmp);
9 LockBitmap newlbmp = new LockBitmap(newbmp);
10 lbmp.LockBits();
11 newlbmp.LockBits();
12
13 Color pixel1, pixel2;
14 for (int x = 0; x < width - 1; x++)
15 {
16 for (int y = 0; y < height - 1; y++)
17 {
18 int r = 0, g = 0, b = 0;
19 pixel1 = lbmp.GetPixel(x, y);
20 pixel2 = lbmp.GetPixel(x + 1, y + 1);
21 r = Math.Abs(pixel1.R - pixel2.R + 128);
22 g = Math.Abs(pixel1.G - pixel2.G + 128);
23 b = Math.Abs(pixel1.B - pixel2.B + 128);
24 if (r > 255)
25 r = 255;
26 if (r < 0)
27 r = 0;
28 if (g > 255)
29 g = 255;
30 if (g < 0)
31 g = 0;
32 if (b > 255)
33 b = 255;
34 if (b < 0)
35 b = 0;
36 newlbmp.SetPixel(x, y, Color.FromArgb(r, g, b));
37 }
38 }
39 lbmp.UnlockBits();
40 newlbmp.UnlockBits();
41 return newbmp;
42 }
浮雕效果
6、柔化
1 //柔化
2 public Bitmap SoftenImage(Bitmap bmp)
3 {
4 int height = bmp.Height;
5 int width = bmp.Width;
6 Bitmap newbmp = new Bitmap(width, height);
7
8 LockBitmap lbmp = new LockBitmap(bmp);
9 LockBitmap newlbmp = new LockBitmap(newbmp);
10 lbmp.LockBits();
11 newlbmp.LockBits();
12
13 Color pixel;
14 //高斯模板
15 int[] Gauss ={ 1, 2, 1, 2, 4, 2, 1, 2, 1 };
16 for (int x = 1; x < width - 1; x++)
17 {
18 for (int y = 1; y < height - 1; y++)
19 {
20 int r = 0, g = 0, b = 0;
21 int Index = 0;
22 for (int col = -1; col <= 1; col++)
23 {
24 for (int row = -1; row <= 1; row++)
25 {
26 pixel = lbmp.GetPixel(x + row, y + col);
27 r += pixel.R * Gauss[Index];
28 g += pixel.G * Gauss[Index];
29 b += pixel.B * Gauss[Index];
30 Index++;
31 }
32 }
33 r /= 16;
34 g /= 16;
35 b /= 16;
36 //处理颜色值溢出
37 r = r > 255 ? 255 : r;
38 r = r < 0 ? 0 : r;
39 g = g > 255 ? 255 : g;
40 g = g < 0 ? 0 : g;
41 b = b > 255 ? 255 : b;
42 b = b < 0 ? 0 : b;
43 newlbmp.SetPixel(x - 1, y - 1, Color.FromArgb(r, g, b));
44 }
45 }
46 lbmp.UnlockBits();
47 newlbmp.UnlockBits();
48 return newbmp;
49 }
柔化
7、锐化
1 //锐化
2 public Bitmap SharpenImage(Bitmap bmp)
3 {
4 int height = bmp.Height;
5 int width = bmp.Width;
6 Bitmap newbmp = new Bitmap(width, height);
7
8 LockBitmap lbmp = new LockBitmap(bmp);
9 LockBitmap newlbmp = new LockBitmap(newbmp);
10 lbmp.LockBits();
11 newlbmp.LockBits();
12
13 Color pixel;
14 //拉普拉斯模板
15 int[] Laplacian = { -1, -1, -1, -1, 9, -1, -1, -1, -1 };
16 for (int x = 1; x < width - 1; x++)
17 {
18 for (int y = 1; y < height - 1; y++)
19 {
20 int r = 0, g = 0, b = 0;
21 int Index = 0;
22 for (int col = -1; col <= 1; col++)
23 {
24 for (int row = -1; row <= 1; row++)
25 {
26 pixel = lbmp.GetPixel(x + row, y + col); r += pixel.R * Laplacian[Index];
27 g += pixel.G * Laplacian[Index];
28 b += pixel.B * Laplacian[Index];
29 Index++;
30 }
31 }
32 //处理颜色值溢出
33 r = r > 255 ? 255 : r;
34 r = r < 0 ? 0 : r;
35 g = g > 255 ? 255 : g;
36 g = g < 0 ? 0 : g;
37 b = b > 255 ? 255 : b;
38 b = b < 0 ? 0 : b;
39 newlbmp.SetPixel(x - 1, y - 1, Color.FromArgb(r, g, b));
40 }
41 }
42 lbmp.UnlockBits();
43 newlbmp.UnlockBits();
44 return newbmp;
45 }
锐化
8、雾化
1 //雾化
2 public Bitmap AtomizationImage(Bitmap bmp)
3 {
4 int height = bmp.Height;
5 int width = bmp.Width;
6 Bitmap newbmp = new Bitmap(width, height);
7
8 LockBitmap lbmp = new LockBitmap(bmp);
9 LockBitmap newlbmp = new LockBitmap(newbmp);
10 lbmp.LockBits();
11 newlbmp.LockBits();
12
13 System.Random MyRandom = new Random();
14 Color pixel;
15 for (int x = 1; x < width - 1; x++)
16 {
17 for (int y = 1; y < height - 1; y++)
18 {
19 int k = MyRandom.Next(123456);
20 //像素块大小
21 int dx = x + k % 19;
22 int dy = y + k % 19;
23 if (dx >= width)
24 dx = width - 1;
25 if (dy >= height)
26 dy = height - 1;
27 pixel = lbmp.GetPixel(dx, dy);
28 newlbmp.SetPixel(x, y, pixel);
29 }
30 }
31 lbmp.UnlockBits();
32 newlbmp.UnlockBits();
33 return newbmp;
34 }
雾化
转载来源:https://www.cnblogs.com/bomo/archive/2013/03/01/2939453.html
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