Get Image Orientation and rotate as per orientation

Question

having problem in getting image orientation with below code

    string fileName = @"D:\...\...\01012015004435.jpeg";      int rotate = 0;     using (var image = System.Drawing.Image.FromFile(fileName))     {         foreach (var prop in image.PropertyItems)         {             if (prop.Id == 0x112)             {                 if (prop.Value[0] == 6)                     rotate = 90;                 if (prop.Value[0] == 8)                     rotate = -90;                 if (prop.Value[0] == 3)                     rotate = 180;                 prop.Value[0] = 1;             }         }     } 

and after get proper orientation i used to rotate image like

private static RotateFlipType OrientationToFlipType(string orientation) {     switch (int.Parse(orientation))     {         case 1:             return RotateFlipType.RotateNoneFlipNone;             break;         case 2:             return RotateFlipType.RotateNoneFlipX;             break;         case 3:             return RotateFlipType.Rotate180FlipNone;             break;         case 4:             return RotateFlipType.Rotate180FlipX;             break;         case 5:             return RotateFlipType.Rotate90FlipX;             break;         case 6:             return RotateFlipType.Rotate90FlipNone;             break;         case 7:             return RotateFlipType.Rotate270FlipX;             break;         case 8:             return RotateFlipType.Rotate270FlipNone;             break;         default:             return RotateFlipType.RotateNoneFlipNone;     } } 

but problem is in first code

prop.Id i always get [20625]

prop.Id == 20625 

so not satisfy the condition every time please let me know if any problem or other option

thanks

Answer 1

There's probably enough information in the other answers and comments to put this all together, but here's a working code example.

This extension method will take a System.Drawing Image, read its Exif Orientation tag (if present), and flip/rotate it (if necessary).

private const int exifOrientationID = 0x112; //274  public static void ExifRotate(this Image img) {     if (!img.PropertyIdList.Contains(exifOrientationID))         return;      var prop = img.GetPropertyItem(exifOrientationID);     int val = BitConverter.ToUInt16(prop.Value, 0);     var rot = RotateFlipType.RotateNoneFlipNone;      if (val == 3 || val == 4)         rot = RotateFlipType.Rotate180FlipNone;     else if (val == 5 || val == 6)         rot = RotateFlipType.Rotate90FlipNone;     else if (val == 7 || val == 8)         rot = RotateFlipType.Rotate270FlipNone;      if (val == 2 || val == 4 || val == 5 || val == 7)         rot |= RotateFlipType.RotateNoneFlipX;      if (rot != RotateFlipType.RotateNoneFlipNone)         img.RotateFlip(rot); } 

Answer 2

Use the following:

• img.PropertyIdList.Contains(orientationId) to check if the Exif tag is present.
• img.GetPropertyItem(orientationId) to get it (after the above check, otherwise you'll get an ArgumentException).
• img.SetPropertyItem(pItem) to set it.

I wrote a simple helper class that does all that: you can check the full source code here.

Other info and a quick case-study is also available on the following post on my blog:

Change image orientation for iPhone and/or Android pics in NET C#