C # Development Auto Photo (Picture) Crop (Zoom) Tool

1. Demand analysis

Using the winform form program, develop a program that can automatically zoom and crop pictures in batches.

I originally wanted to find the type of tools from the Internet and use them directly, but the tools that can be found on the Internet are either unusable or very

disgustingly, there are still a bunch of tools after downloading. The plug-in, or I can’t use it.

This program is based on my personal needs. I want to batch process all the portrait photos taken directly into 1-inch photos, which can save a lot of time for cropping pictures.

Here is an explanation of the generated 1-inch picture: The size of the 1-inch picture I found online is: photo size (inch) (cm) (pixel)

　　1 inch 2.5*3.5cm 413*295

Because there may be horizontal and vertical shooting during shooting, although the generated picture is also 1-inch, but the direction is different, this does not affect, you can also Modified in the code.

Look at the effect first:

It can be seen that the quality of the image will be lower after zooming the image, and cropping will not have this problem.

2. Image cropping code

 1 　　　　 /// 


 2 /// Crop button

 3 /// 

 4 /// 

 5 /// 

 6 private  void Button1_Click(object sender, EventArgs e)

 7  {

 8 OpenFileDialog dialog = new OpenFileDialog(); < span style="color: #008000;">//Open the folder and select the picture

 9 dialog.Filter = "(*.jpg,*.png,*.jpeg,*.bmp,*.gif)|*.jgp;*.png;*.jpeg;*.bmp;*.gif;*.JPG; *.PNG;|All files(*.*)|*.*";

10 dialog.Multiselect = true;

11 if (dialog.ShowDialog() ==  DialogResult.OK)

12  {

13 string path = dialog.FileName;

14 Bitmap img = new Bitmap(path);

15 Image img2 = ImageTailor(img, 319, 449); //Settings 1 inch photo

16 string imgSaveUrl = @"D:/My picture/Processing completed/" + dialog.SafeFileName; //Save the picture to the folder

17  img2.Save(imgSaveUrl);

18 img2.Dispose(); //< span style="color: #008000;">Release resources

19 }

20 }

21

22 public Image ImageTailor(Bitmap bmp,int nowWidth,int nowHeight)

23  {

24 Bitmap newbm = new Bitmap(nowWidth, nowHeight);

25 Graphics g = Graphics.FromImage(newbm);

26 g.InterpolationMode = InterpolationMode.HighQualityBicubic;

27 g.SmoothingMode = SmoothingMode.HighQuality;

28 g.CompositingQuality = CompositingQuality.HighQuality;

29 //The front Rectangle represents the size of the canvas, and the back Rectangle represents the area left on the right after cropping

30 g.DrawImage(bmp, new Rectangle(0, 0, nowWidth, nowHeight), new  Rectangle(0, 0, bmp.Width / 2, bmp.Height), GraphicsUnit.Pixel);

31  g.Dispose();

32 return newbm;

33 }

The method of cutting the button is not perfect yet, so far, only the single The crop of a picture. If you want to modify it into batches, you only need to set the openfiledialog control to allow multiple selections, and then perform loop processing according to the number of selected pictures.

The zoom button at the back is more complete, allowing multiple selection of pictures and batch processing.

3. Picture zoom code:

The code for zooming pictures looks more complicated, but the logic is not difficult. Some codes are also written by other people on the Internet, and used them (the “middleware is indeed written by myself, I don’t want to change it back, haha”)

< span style="color: #008080;"> 1　　　　  /// 
 

 2 /// Show picture

 3 /// 

 4 /// 

 5 /// 

 6 private  void Button_SelectImg_Click(object sender, EventArgs e)

 7  {

 8 OpenFileDialog dialog = new OpenFileDialog();

 9 dialog.Filter = "(*.jpg,*.png,*.jpeg,*.bmp,*.gif)|*.jgp;*.png;*.jpeg;*.bmp;*.gif; *.JPG;*.PNG;|All files(*.*)|*.*";

 10 dialog.Multiselect = true; //Allow multiple selection of files

 11 string folder = "";

 12 if (Directory.Exists(@"D:/My picture/Processing completed/"))

 13  {

 14 folder = @"D:/My picture/Processing completed/" ;

 15 }

 16 else

 17  {

 18 Directory.CreateDirectory(@"D:/My picture/Processing completed/");

 19 folder = @"D:/My picture/Processing completed/" ;

 20 }

 21 if (dialog.ShowDialog() ==  DialogResult.OK)

 22  {

 23 int fileCount = dialog.FileNames.Length; //Get the number of selected pictures

 24 int countNum = fileCount;

 25 for (int i = 0; i )

 26  {

 27 string path = dialog.FileNames[i] ; //The absolute path of the picture, including the picture name

 28 Image img = GetReducedImage(path);

 29 string imgSaveUrl = folder + dialog.SafeFileNames[ i]; //Save the picture to a folder

 30  img.Save(imgSaveUrl);

 31 img.Dispose(); //< span style="color: #008000;">Release resources

 32 countNum--;

 33 if (countNum == 0)

 34  {

 35 MessageBox.Show("Processing of pictures is complete, total processing:" + fileCount + "sheets");

 36 }

 37 }

 38 }

 39 }

 40

 41 /// 


 42 /// Middleware, write and play

 43 /// 

 44 /// 

 45 /// 

 46 public Image GetReducedImage(string fileName)

 47  {

 48 Image ResourceImage = Image.FromFile(fileName);

 49 Bitmap img = new Bitmap(ResourceImage);

 50 return ZoomImage(img, 449, 319);

 51 }

 52

 53 #region Scaling the image proportionally

 54 /// 


 55 /// Scaling pictures proportionally

 56 /// 

 57 /// 

 58 /// 

 59 /// 

 60 /// 

 61 private Bitmap ZoomImage(Bitmap bitmap, int destHeight, int destWidth)

 62  {

 63 try

 64  {

 65 Image sourImage = bitmap;

 66 ImageCodecInfo ici = GetEncoder(ImageFormat.Jpeg);

 67 int width = 0, height = 0;

 68 //Scale proportionally

 69 int sourWidth = sourImage.Width;

 70 int sourHeight = sourImage.Height;

 71 if (sourHeight> destHeight || sourWidth>  destWidth)

 72  {

 73 if ((sourWidth * destHeight)> ( sourHeight * destWidth))

 74  {

 75 width = destWidth;

 76 height = (destWidth * sourHeight) / sourWidth;

 77 }

 78 else

 79  {

 80 height = destHeight;

 81 width = (sourWidth * destHeight) / sourHeight;

 82 }

 83 }

 84 else

 85  {

 86 width = sourWidth;

 87 height = sourHeight;

 88 }

 89 Bitmap destBitmap = new Bitmap(destWidth, destHeight);

 90 Graphics g = Graphics.FromImage(destBitmap);

 91  g.Clear(Color.Transparent);

 92 //Set the drawing quality of the canvas

 93 g.CompositingQuality = CompositingQuality.HighQuality;

 94 g.SmoothingMode = SmoothingMode.HighQuality;

 95 g.InterpolationMode = InterpolationMode.HighQualityBilinear;

 96 g.DrawImage(sourImage, new Rectangle( (destWidth-width) / 2, (destHeight-height) / 2, width, height), 0, 0 , sourImage.Width, sourImage.Height, GraphicsUnit.Pixel);

 97  g.Dispose();

 98 //Set compression quality

 99 EncoderParameters encoderParams = new EncoderParameters();

100 long[] quality = new long[1];

101 quality[0] = 100;

102 EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);

103 encoderParams.Param[0] = encoderParam;

104  sourImage.Dispose();

105 return destBitmap;

106 }

107 catch

108  {

109 return bitmap;

110 }

111 }

112 #endregion

113

114 public  static ImageCodecInfo GetEncoder(ImageFormat format)

115  {

116 ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();

117 foreach (ImageCodecInfo codec in codecs)

118  {

119 if (codec.FormatID == format.Guid)

120  {

121 return codec;

122 }

123 }

124 return null;

125 }

4. Summary:

Above, the simple function of batch zooming (cropping) pictures into 1-inch pictures is completed.

 1 　　　　 /// 


 2 /// Crop button

 3 /// 

 4 /// 

 5 /// 

 6 private  void Button1_Click(object sender, EventArgs e)

 7  {

 8 OpenFileDialog dialog = new OpenFileDialog(); < span style="color: #008000;">//Open the folder and select the picture

 9 dialog.Filter = "(*.jpg,*.png,*.jpeg,*.bmp,*.gif)|*.jgp;*.png;*.jpeg;*.bmp;*.gif;*.JPG; *.PNG;|All files(*.*)|*.*";

10 dialog.Multiselect = true;

11 if (dialog.ShowDialog() ==  DialogResult.OK)

12  {

13 string path = dialog.FileName;

14 Bitmap img = new Bitmap(path);

15 Image img2 = ImageTailor(img, 319, 449); //Settings 1 inch photo

16 string imgSaveUrl = @"D:/My picture/Processing completed/" + dialog.SafeFileName; //Save the picture to the folder

17  img2.Save(imgSaveUrl);

18                 img2.Dispose();                                                                  //释放资源

19             }

20         }

21 

22         public Image ImageTailor(Bitmap bmp,int nowWidth,int nowHeight)

23         {

24             Bitmap newbm = new Bitmap(nowWidth, nowHeight);

25             Graphics g = Graphics.FromImage(newbm);

26             g.InterpolationMode = InterpolationMode.HighQualityBicubic;

27             g.SmoothingMode = SmoothingMode.HighQuality;

28             g.CompositingQuality = CompositingQuality.HighQuality;

29             //前Rectangle代表画布大小，后Rectangle代表裁剪后右边留下的区域

30             g.DrawImage(bmp, new Rectangle(0, 0, nowWidth, nowHeight), new Rectangle(0, 0, bmp.Width / 2, bmp.Height), GraphicsUnit.Pixel);

31             g.Dispose();

32             return newbm;

33         }

  1　　　　  /// 


  2         /// 显示图片

  3         /// 

  4         /// 

  5         /// 

  6         private void Button_SelectImg_Click(object sender, EventArgs e)

  7         {

  8             OpenFileDialog dialog = new OpenFileDialog();

  9             dialog.Filter = "(*.jpg,*.png,*.jpeg,*.bmp,*.gif)|*.jgp;*.png;*.jpeg;*.bmp;*.gif;*.JPG;*.PNG;|All files(*.*)|*.*";

 10             dialog.Multiselect = true;                                                              //允许文件多选

 11             string folder = "";

 12             if (Directory.Exists(@"D:/我的图片/处理完成/"))

 13  {

 14                 folder = @"D:/我的图片/处理完成/";

 15             }

 16             else

 17             {

 18                 Directory.CreateDirectory(@"D:/我的图片/处理完成/");

 19                 folder = @"D:/我的图片/处理完成/"; 

 20             }

 21             if (dialog.ShowDialog() == DialogResult.OK) 

 22             {

 23                 int fileCount = dialog.FileNames.Length;                                            //获取选中图片数量

 24                 int countNum = fileCount;

 25                 for (int i = 0; i < fileCount; i++)

 26                 {

 27                     string path = dialog.FileNames[i];                                              //图片绝对路径,包含图片名称

 28                     Image img = GetReducedImage(path);

 29                     string imgSaveUrl = folder + dialog.SafeFileNames[i];                           //保存图片到文件夹

 30                     img.Save(imgSaveUrl);

 31                     img.Dispose();                                                                  //释放资源

 32                     countNum--;

 33                     if (countNum == 0)

 34                     {

 35                         MessageBox.Show("处理图片完成，总计处理：" + fileCount + "张");

 36                     }

 37                 }

 38             }

 39         }

 40 

 41         /// 


 42         /// 中间件，写着玩

 43         /// 

 44         /// 

 45         /// 

 46         public Image GetReducedImage(string fileName)

 47         {

 48             Image ResourceImage = Image.FromFile(fileName);

 49             Bitmap img = new Bitmap(ResourceImage);

 50             return ZoomImage(img, 449, 319);

 51         }

 52 

 53         #region 等比例缩放图片

 54         /// 


 55         /// 等比例缩放图片

 56         /// 

 57         /// 

 58         /// 

 59         /// 

 60         /// 

 61         private Bitmap ZoomImage(Bitmap bitmap, int destHeight, int destWidth)

 62         {

 63             try

 64             {

 65                 Image sourImage = bitmap;

 66                 ImageCodecInfo ici = GetEncoder(ImageFormat.Jpeg);

 67                 int width = 0, height = 0;

 68                 //按比例缩放           

 69                 int sourWidth = sourImage.Width;

 70                 int sourHeight = sourImage.Height;

 71                 if (sourHeight > destHeight || sourWidth > destWidth)

 72                 {

 73                     if ((sourWidth * destHeight) > (sourHeight * destWidth))

 74                     {

 75                         width = destWidth;

 76                         height = (destWidth * sourHeight) / sourWidth;

 77                     }

 78                     else

 79                     {

 80                         height = destHeight;

 81                         width = (sourWidth * destHeight) / sourHeight;

 82                     }

 83                 }

 84                 else

 85                 {

 86                     width = sourWidth;

 87                     height = sourHeight;

 88                 }

 89                 Bitmap destBitmap = new Bitmap(destWidth, destHeight);

 90                 Graphics g = Graphics.FromImage(destBitmap);

 91                 g.Clear(Color.Transparent);

 92                 //设置画布的描绘质量         

 93                 g.CompositingQuality = CompositingQuality.HighQuality;

 94                 g.SmoothingMode = SmoothingMode.HighQuality;

 95                 g.InterpolationMode = InterpolationMode.HighQualityBilinear;

 96                 g.DrawImage(sourImage, new Rectangle((destWidth - width) / 2, (destHeight - height) / 2, width, height), 0, 0, sourImage.Width, sourImage.Height, GraphicsUnit.Pixel);

 97                 g.Dispose();

 98                 //设置压缩质量     

 99                 EncoderParameters encoderParams = new EncoderParameters();

100                 long[] quality = new long[1];

101                 quality[0] = 100;

102                 EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);

103                 encoderParams.Param[0] = encoderParam;

104                 sourImage.Dispose();

105                 return destBitmap;

106             }

107             catch

108             {

109                 return bitmap;

110             }

111         }

112         #endregion

113 

114         public static ImageCodecInfo GetEncoder(ImageFormat format)

115         {

116             ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();

117             foreach (ImageCodecInfo codec in codecs)

118             {

119                 if (codec.FormatID == format.Guid)

120                 {

121                     return codec;

122                 }

123             }

124             return null;

125         }