【C#】图片处理(底片,黑白,锐化,柔化,浮雕,雾化)

2021/8/17 9:06:01

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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