C # image Cropping

 

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1. /// <Summary>
2. /// Narrow down the cropped Image
3. /// </Summary>
4. /// <Param name = "int_width"> to narrow down the cropped image width </param>
5. /// <Param name = "int_height"> reduce the length of the cropped image </param>
6. /// <Param name = "input_imgurl"> path of the image to be processed </param>
7. /// <Param name = "out_imgurl"> processed image path </param>
8. Public void imgreducecutout (INT int_width, int int_height, string input_imgurl, string out_imgurl)
9. {
10. // === Size of the uploaded standard image ===
11. Int int_standard_width = 160;
12. Int int_standard_height = 160;
14. Int reduce_width = 0; // The reduced width.
15. Int reduce_height = 0; // The reduced height.
16. Int cutout_width = 0; // specifies the cropped width.
17. Int cutout_height = 0; // crop height
18. Int level = 100; // the range of the thumbnail quality from 1
20. // === Get zoom out, crop size ===
21. If (int_standard_height * int_width/int_standard_width> int_height)
22. {
23. Performance_width = int_width;
24. Performance_height = int_standard_height * int_width/int_standard_width;
25. Cutout_width = int_width;
26. Cutout_height = int_height;
27. }
28. Else if (int_standard_height * int_width/int_standard_width <int_height)
29. {
30. Performance_width = int_standard_width * int_height/int_standard_height;
31. Performance_height = int_height;
32. Cutout_width = int_width;
33. Cutout_height = int_height;
34. }
35. Else
36. {
37. Performance_width = int_width;
38. Performance_height = int_height;
39. Cutout_width = int_width;
40. Cutout_height = int_height;
41. }
43. // === Create an image object through a connection ===
44. System. Drawing. Image oldimage = system. Drawing. image. fromfile (server. mappath (input_imgurl ));
46. // === Zoom out image ====
47. System. Drawing. Image thumbnailimage = oldimage. getthumbnailimage (performance_width, performance_height, new system. Drawing. image. getthumbnailimageabort (thumbnailcallback), intptr. Zero );
48. Bitmap Bm = new Bitmap (thumbnailimage );
50. // === Functions for processing JPG quality ====
51. Imagecodecinfo [] codecs = imagecodecinfo. getimageencoders ();
52. Imagecodecinfo ICI = NULL;
53. Foreach (imagecodecinfo Codec in codecs)
54. {
55. If (codec. mimetype = "image/JPEG ")
56. ICI = codec;
57. }
58. Encoderparameters Ep = new encoderparameters ();
59. Ep. Param [0] = new encoderparameter (encoder. Quality, (long) level );
61. // Bm. Save (server. mappath ("2.jpg"), ici, EP );
63. // === Crop an image ====
64. Rectangle clonerect = new rectangle (0, 0, cutout_width, cutout_height );
65. Pixelformat format = BM. pixelformat;
66. Bitmap clonebitmap = BM. Clone (clonerect, format );
68. // === Save the image ====
69. Clonebitmap. Save (server. mappath (out_imgurl), ici, EP );
70. }