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

Do the images you are viewing specify their orientation? I'm not sure that this is a property that is set by default (i.e what could be the default orientation of your gravatar?) — Sayse, Jan 08 '15 at 07:36
Rather than inspecting every image `PropertyItem`, you should simply query for the one you want, e.g. `image.GetPropertyItem(0x112);`. If the rotation property isn't present, it will throw an exception (which you can catch and handle). Not all image files will have a rotation property. Note also that the `PropertyItem.Type` value should be 3 (16-bit integers), and the `Len` value at least 2. While the code you have should work, IMHO it is more correct to go ahead and use `BitConverter` to convert the first two bytes in the `Value` array to an `Int16`, in case there's some weird value > 255. — Peter Duniho, Jan 08 '15 at 08:36
hi thanks for reply, actually i am service provider and web service in wcf service. android and ios developer sent me image and as per image i have to rotate or crop. so they need to set image property? — Jimmy Darji, Jan 08 '15 at 12:25
A note if you are using `Image.FromStream` to read the image. You must set `useEmbeddedColorManagement` to `true` for this to work. Otherwise, `PropertyItems` will be empty. Example: `var image = Image.FromStream(memoryStream, true);` — rybl, Sep 02 '21 at 20:52

score 57 · Answer 1 · edited Jan 11 '19 at 20:37

57

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);
}

edited Jan 11 '19 at 20:37

Justin

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answered Jan 19 '18 at 18:44

saucecontrol

1,288
14
16

This worked perfectly on my dev machine. I upload it to production and, for the same picture, it acts as if the file doesn't have the Exif information. Do you know why that could be? – Diego Jancic Nov 28 '18 at 21:12
`System.Drawing` uses the [Windows Imaging Component](https://docs.microsoft.com/en-us/windows/desktop/wic/-wic-about-windows-imaging-codec) underneath, so there could be some difference in codec capabilities between your dev and prod Windows installs. Same applies if you're using `System.Drawing` on a non-Windows machine, where a compatibility layer would be in place. – saucecontrol Nov 29 '18 at 22:23
I've put a question here in case you know more info: https://stackoverflow.com/questions/53546113/net-exif-information-not-working-on-production-server Thanks! – Diego Jancic Nov 29 '18 at 23:07
1

Thanks! I noticed that iphone images are turned to the side when I try to display them. I do a re-size which strips the exif data (which is what I want, that makes the display correctly)... but it was saving them the wrong way. Perfect fix for me nice one – eric k atwood Mar 01 '20 at 21:41
1

You may also want to use `SetPropertyItem` to set the `exifOrientationID` to `0`. – Jamie Kitson Jul 30 '21 at 15:25
@JamieKitson or just remove it after rotation img.RemovePropertyItem(exifOrientationID); – mhapps May 18 '22 at 10:26

Darkseal · Answer 2 · 2018-10-19T15:09:13.740

6

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#

edited Oct 19 '18 at 15:09

answered Jul 19 '16 at 13:28

Darkseal

9,334
8
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I followed the link but I did not find the full source code for your solution. – Nicholas Hunter Mar 18 '22 at 16:38

score 2 · Answer 3 · answered Jan 08 '15 at 08:45

2

You can use this link http://regex.info/exif.cgi to examine your image embedded metadata. If you don't find "0x0112" in the EXIF table, then the image does not contain rotation property.

answered Jan 08 '15 at 08:45

TH Todorov

1,099
11
23

Get Image Orientation and rotate as per orientation

3 Answers3

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