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Resize Images Keeping Aspect Ratio

/ Published in: C#
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  1. /// <summary>
  2. /// Allows for image resizing. if AllowLargerImageCreation = true 
  3. /// you want to increase the size of the image
  4. /// </summary>
  5. /// <param name="bytes"></param>
  6. /// <param name="NewWidth"></param>
  7. /// <param name="MaxHeight"></param>
  8. /// <param name="AllowLargerImageCreation"></param>
  9. /// <returns></returns>
  10. /// <remarks></remarks>
  11. public static byte[] ResizeImage(byte[] bytes, int NewWidth, int MaxHeight, bool AllowLargerImageCreation)
  12. {
  13.  
  14. 	Image FullsizeImage = null;
  15. 	Image ResizedImage = null;
  16. 	//Cast bytes to an image
  17. 	FullsizeImage = byteArrayToImage(bytes);
  18.  
  19. 	// Prevent using images internal thumbnail
  20. 	FullsizeImage.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone);
  21. 	FullsizeImage.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone);
  22.  
  23. 	// If we are re sizing upwards to a bigger size
  24. 	if (AllowLargerImageCreation) {
  25. 		if (FullsizeImage.Width <= NewWidth) {
  26. 			NewWidth = FullsizeImage.Width;
  27. 		}
  28. 	}
  29.  
  30. 	//Keep aspect ratio
  31. 	int NewHeight = FullsizeImage.Height * NewWidth / FullsizeImage.Width;
  32. 	if (NewHeight > MaxHeight) {
  33. 		// Resize with height instead
  34. 		NewWidth = FullsizeImage.Width * MaxHeight / FullsizeImage.Height;
  35. 		NewHeight = MaxHeight;
  36. 	}
  37.  
  38. 	ResizedImage = FullsizeImage.GetThumbnailImage(NewWidth, NewHeight, null, IntPtr.Zero);
  39.  
  40. 	// Clear handle to original file so that we can overwrite it if necessary
  41. 	FullsizeImage.Dispose();
  42.  
  43. 	return imageToByteArray(ResizedImage);
  44. }
  45.  
  46.  
  47. /// <summary>
  48. /// convert image to byte array
  49. /// </summary>
  50. /// <param name="imageIn"></param>
  51. /// <returns></returns>
  52. private static byte[] imageToByteArray(System.Drawing.Image imageIn)
  53. {
  54. 	MemoryStream ms = new MemoryStream();
  55. 	imageIn.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
  56. 	return ms.ToArray();
  57. }
  58.  
  59.  
  60. /// <summary>
  61. /// Convert a byte array to an image
  62. /// </summary>
  63. /// <remarks></remarks>
  64. public static Image byteArrayToImage(byte[] byteArrayIn)
  65. {
  66. 	MemoryStream ms = new MemoryStream(byteArrayIn);
  67. 	Image returnImage = Image.FromStream(ms);
  68. 	return returnImage;
  69. }

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