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sweeperqb  
#1 Posted : Friday, April 2, 2021 2:02:52 PM(UTC)
sweeperqb

Rank: Advanced Member

Groups: Authorized User, Developers
Joined: 5/30/2020(UTC)
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FileHelper.WriteImageFile occasionally rotates images on resize. I believe it is because it is ignoring EXIF data embedded in the JPEG image. This can be fixed by adding the following code to the ImageUpload action of the AssetsController, just after the using block:
Code:
using (System.Drawing.Image originalImage = System.Drawing.Image.FromFile(tempImagePath))
:

Code:
//Check for exif data to determine orientation of camera when photo was taken and rotate to what's expected
if (originalImage.PropertyIdList.Contains(0x112)) //0x112 = Orientation
{
    var prop = originalImage.GetPropertyItem(0x112);
    if (prop.Type == 3 && prop.Len == 2)
    {
        UInt16 orientationExif = BitConverter.ToUInt16(originalImage.GetPropertyItem(0x112).Value, 0);
        if (orientationExif == 8)
        {
           originalImage.RotateFlip(RotateFlipType.Rotate270FlipNone);
        }
        else if (orientationExif == 3)
        {
           originalImage.RotateFlip(RotateFlipType.Rotate180FlipNone);
        }
        else if (orientationExif == 6)
        {
           originalImage.RotateFlip(RotateFlipType.Rotate90FlipNone);
        }
    }
}
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