Image orientation and rotation to match orientation
image orientation problem 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 correct orientation i used to rotate the 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 the problem is in the first code
prop.Id
I always get [20625]
prop.Id == 20625
so do not meet the condition every time please let me know if you have any problems or other options.
thank
source to share
There's probably enough information in the other answers and comments to put it all together, but here's an example of working code.
This extension method will accept 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);
}
source to share
Use the following:
-
img.PropertyIdList.Contains(orientationId)
to check for the presence of an Exif tag. -
img.GetPropertyItem(orientationId)
to get it (after checking above, otherwise you will receiveArgumentException
). -
img.SetPropertyItem(pItem)
to install it.
I wrote a simple helper class that does all of this: you can check out the full source code here .
Other information and a short case study are also available in the following post on my blog:
Change image orientation for iPhone and / or Android photos in NET C #
source to share
You can use this link http://regex.info/exif.cgi to view the embedded image metadata. If you do not find "0x0112" in the EXIF table, then the image will not contain the rotation property.
source to share