C # generating high-definition thumbnails based on large images

C # generate the high-definition thumbnail code. a c # function module contains comments and a function parameter. Here we can see the C # generate the thumbnail code:

01 public static void SetGoodImage (string fileName, string newFile, int maxHeight, int maxWidth, long qualitys)

02 {

03 if (qualitys = 0)

04 {

05 qualitys = 80;

06}

07 using (System. Drawing. Image img = System. Drawing. Image. FromFile (fileName ))

08 {

09 System. Drawing. Imaging. ImageFormat

10 thisFormat = img. RawFormat;

11 Size newSize = NewSize (maxWidth, maxHeight, img. Width, img. Height );

12 Bitmap outBmp = new Bitmap (newSize. Width, newSize. Height );

13 Graphics g = Graphics. FromImage (outBmp );

14 // set the painting quality of the canvas

15g. CompositingQuality = CompositingQuality. HighQuality;

16g. SmoothingMode = SmoothingMode. HighQuality;

17g. InterpolationMode = InterpolationMode. HighQualityBicubic;

18g. DrawImage (img, new Rectangle (0, 0, newSize. Width, newSize. Height ),

19 0, 0, img. Width, img. Height, GraphicsUnit. Pixel );

20g. Dispose ();

21 // The following Code sets the compression quality when saving the image

22 EncoderParameters encoderParams = new EncoderParameters ();

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

24 quality [0] = qualitys;

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

26 encoderParams. Param [0] = encoderParam;

27 // obtain the ImageCodecInfo object that contains information about the built-in image decoder.

28 ImageCodecInfo [] arrayICI = ImageCodecInfo. GetImageEncoders ();

29 ImageCodecInfo javasici = null;

30 for (int x = 0;

31 x <arrayICI. Length;

32 x ++)

33 {

34 if (arrayICI [x]. FormatDescription. Equals ("JPEG "))

35 {

36 jpegICI = arrayICI [x];

37 // set JPEG encoding

38 break;

39}

40}

41 if (policici! = Null)

42 {

43 outBmp. Save (newFile, jpegICI, encoderParams );

44}

45 else

46 {

47 outBmp. Save (newFile, thisFormat );

48}

49 img. Dispose ();

50 outBmp. Dispose ();

51}

52}

Function parameter description:

View sourceprint? 1 // original file

2 // New File

3 /// maximum height

4 /// maximum width

5 // quality. If it is 0, it is set to 80.

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