This seems to be a bit of an infamous error all over the web. So much so that I have been unable to find an answer to my problem as my scenario doesn't fit. An exception gets thrown when I save the image to the stream.

Weirdly this works perfectly with a png but gives the above error with jpg and gif which is rather confusing.

Most similar problem out there relate to saving images to files without permissions. Ironically the solution is to use a memory stream as I am doing....

public static byte[] ConvertImageToByteArray(Image imageToConvert)
    using (var ms = new MemoryStream())
        ImageFormat format;
        switch (imageToConvert.MimeType())
            case "image/png":
                format = ImageFormat.Png;
            case "image/gif":
                format = ImageFormat.Gif;
                format = ImageFormat.Jpeg;

        imageToConvert.Save(ms, format);
        return ms.ToArray();

More detail to the exception. The reason this causes so many issues is the lack of explanation :(

System.Runtime.InteropServices.ExternalException was unhandled by user code
Message="A generic error occurred in GDI+."
   at System.Drawing.Image.Save(Stream stream, ImageCodecInfo encoder, EncoderParameters    encoderParams)
   at System.Drawing.Image.Save(Stream stream, ImageFormat format)
   at Caldoo.Infrastructure.PhotoEditor.ConvertImageToByteArray(Image imageToConvert) in C:\Users\Ian\SVN\Caldoo\Caldoo.Coordinator\PhotoEditor.cs:line 139
   at Caldoo.Web.Controllers.PictureController.Croppable() in C:\Users\Ian\SVN\Caldoo\Caldoo.Web\Controllers\PictureController.cs:line 132
   at lambda_method(ExecutionScope , ControllerBase , Object[] )
   at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)
   at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClassa.<InvokeActionMethodWithFilters>b__7()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)

OK things I have tried so far.

  1. Cloning the image and working on that.
  2. Retrieving the encoder for that MIME passing that with jpeg quality setting.

Solution 1

OK I seem to have found the cause just by sheer luck and its nothing wrong with that particular method, it's further back up the call stack.

Earlier I resize the image and as part of that method I return the resized object as follows. I have inserted two calls to the above method and a direct save to a file.

// At this point the new bitmap has no MimeType
// Need to output to memory stream
using (var m = new MemoryStream())
       dst.Save(m, format);

       var img = Image.FromStream(m);

       var bytes = PhotoEditor.ConvertImageToByteArray(img);

       return img;

It appears that the memory stream that the object was created on has to be open at the time the object is saved. I am not sure why this is. Is anyone able to enlighten me and how I can get around this.

I only return from a stream because after using the resize code similar to this the destination file has an unknown mime type (img.RawFormat.Guid) and Id like the Mime type to be correct on all image objects as it makes it hard write generic handling code otherwise.


This didn't come up in my initial search but here's the answer from Jon Skeet

Solution 2

If you are getting that error , then I can say that your application doesn't have a write permission on some directory.

For example, if you are trying to save the Image from the memory stream to the file system , you may get that error.

Please if you are using XP, make sure to add write permission for the aspnet account on that folder.

If you are using windows server (2003,2008) or Vista, make sure that add write permission for the Network service account.

Hope it help some one.

Solution 3

I'll add this cause of the error as well in hopes it helps some future internet traveler. :)

GDI+ limits the maximum height of an image to 65500

We do some basic image resizing, but in resizing we try to maintain aspect ratio. We have a QA guy who's a little too good at this job; he decided to test this with a ONE pixel wide photo that was 480 pixels tall. When the image was scaled to meet our dimensions, the height was north of 68,000 pixels and our app exploded with A generic error occurred in GDI+.

You can verify this yourself with test:

  int width = 480;
  var height = UInt16.MaxValue - 36; //succeeds at 65499, 65500
      var image = new Bitmap(width, height);
      using(MemoryStream ms = new MemoryStream())
        //error will throw from here
        image.Save(ms, ImageFormat.Jpeg);
      height += 1;
  catch(Exception ex)
    //explodes at 65501 with "A generic error occurred in GDI+."

It's too bad there's not a friendly .net ArgumentException thrown in the constructor of Bitmap.

Solution 4

This article explains in detail what exactly happens: Bitmap and Image constructor dependencies

In short, for a lifetime of an Image constructed from a stream, the stream must not be destroyed.

So, instead of

using (var strm = new ... )  {
    myImage = Image.FromStream(strm);

try this

Stream imageStream;

    imageStream = new ...;
    myImage = Image.FromStream(strm);

and close imageStream at the form close or web page close.

Solution 5

You'll also get this exception if you try to save to an invalid path or if there's a permissions issue.

If you're not 100% sure that the file path is available and permissions are correct then try writing a to a text file. This takes just a few seconds to rule out what would be a very simple fix.

var img = System.Drawing.Image.FromStream(incomingStream);

// img.Save(path);
System.IO.File.WriteAllText(path, "Testing valid path & permissions.");

And don't forget to clean up your file.

Solution 6

Save image to bitmap variable

using (var ms = new MemoryStream())
    Bitmap bmp = new Bitmap(imageToConvert);
    bmp.Save(ms, format);
    return ms.ToArray();

Solution 7

Just in case if someone is doing as stupid stuff as I was. 1. make sure path does exist. 2. make sure you have permissions to write. 3. make sure your path is correct, in my case I was missing file name in the TargetPath :(

it should have said, your path sucks than "A generic error occurred in GDI+"

Solution 8

I also got this error when saving JPEGs, but only for certain images.

My final code:

    img.SaveJpeg(tmpFile, quality); // This is always successful for say image1.jpg, but always throws the GDI+ exception for image2.jpg
  catch (Exception ex)
    // Try HU's method: Convert it to a Bitmap first
    img = new Bitmap(img); 
    img.SaveJpeg(tmpFile, quality); // This is always successful

I didn't create the images so I can't tell what the difference is.
I'd appreciate if anyone could explain that.

This is my SaveJpeg function just FYI:

private static void SaveJpeg(this Image img, string filename, int quality)
  EncoderParameter qualityParam = new EncoderParameter(Encoder.Quality, (long)quality);
  ImageCodecInfo jpegCodec = GetEncoderInfo("image/jpeg");
  EncoderParameters encoderParams = new EncoderParameters(1);
  encoderParams.Param[0] = qualityParam;
  img.Save(filename, jpegCodec, encoderParams);

private static ImageCodecInfo GetEncoderInfo(string mimeType)
    var encoders = ImageCodecInfo.GetImageEncoders();
    var encoder = encoders.SingleOrDefault(c => string.Equals(c.MimeType, mimeType, StringComparison.InvariantCultureIgnoreCase));
    if (encoder == null) throw new Exception($"Encoder not found for mime type {mimeType}");
    return encoder;

Solution 9

Had a very similar problem and also tried cloning the image which doesn't work. I found that the best solution was to create a new Bitmap object from the image that was loaded from the memory stream. That way the stream can be disposed of e.g.

using (var m = new MemoryStream())
    var img = new Bitmap(Image.FromStream(m));
    return img;

Hope this helps.

Solution 10

I found that if one of the parent folders where I was saving the file had a trailing space then GDI+ would throw the generic exception.

In other words, if I tried to save to "C:\Documents and Settings\myusername\Local Settings\Temp\ABC DEF M1 Trended Values \Images\picture.png" then it threw the generic exception.

My folder name was being generated from a file name that happened to have a trailing space so it was easy to .Trim() that and move on.

Solution 11

if your code is as follows then also this error occurs

private Image GetImage(byte[] byteArray)
   using (var stream = new MemoryStream(byteArray))
       return Image.FromStream(stream);

The correct one is

private Image GetImage(byte[] byteArray)
   var stream = new MemoryStream(byteArray))
   return Image.FromStream(stream);        

This may be because we are returning from the using block

Solution 12

This is an expansion / qualification of Fred's response which stated: "GDI limits the height of an image to 65534". We ran into this issue with one of our .NET applications, and having seen the post, our outsourcing team raised their hands in the air and said they couldn't fix the problem without major changes.

Based on my testing, it's possible to create / manipulate images with a height larger than 65534, but the issue arises when saving to a stream or file IN CERTAIN FORMATS. In the following code, the t.Save() method call throws our friend the generic exception when the pixel height is 65501 for me. For reasons of curiosity, I repeated the test for width, and the same limit applied to saving.

    for (int i = 65498; i <= 100000; i++)
        using (Bitmap t = new Bitmap(800, i))
        using (Graphics gBmp = Graphics.FromImage(t))
            Color green = Color.FromArgb(0x40, 0, 0xff, 0);
            using (Brush greenBrush = new SolidBrush(green))
                // draw a green rectangle to the bitmap in memory
                gBmp.FillRectangle(greenBrush, 0, 0, 799, i);
                if (File.Exists("c:\\temp\\i.jpg"))
                t.Save("c:\\temp\\i.jpg", ImageFormat.Jpeg);

The same error also occurs if you write to a memory stream.

To get round it, you can repeat the above code and substitute ImageFormat.Tiff or ImageFormat.Bmp for ImageFormat.Jpeg.

This runs up to heights / widths of 100,000 for me - I didn't test the limits. As it happens .Tiff was a viable option for us.


The in memory TIFF streams / files consume more memory than their JPG counterparts.

Solution 13

Error occurring because of Permission. make sure folder have ALL THE PERMISSION.

public Image Base64ToImage(string base64String)
        // Convert Base64 String to byte[]
        byte[] imageBytes = Convert.FromBase64String(base64String);
        MemoryStream ms = new MemoryStream(imageBytes, 0,

        // Convert byte[] to Image
        ms.Write(imageBytes, 0, imageBytes.Length);
        Image image = Image.FromStream(ms, true);
        return image;


Solution 14

SOLVED - I had this exact problem. The fix, for me, was to up the disk quota for IUSR on the IIS server. In this instance, we have a catalog app with images of items and such. The upload quota for the "Anonymous Web User" was set to 100MB, which is the default for this particular hosting company's IIS servers. I upped it to 400MB and was able to upload images without error.

This might not be your issue, but if it is, it's an easy fix.

Solution 15

In my case the problem was in the path I was saving (the root C:\). Changing it to D:\111\ made the exception go away.

Solution 16

Another cause for this error - the path you indicate in the Save method of the Bitmap instance doesn't exist or you haven't supplied a full / valid path.

Just had this error because I was passing in a filename and not a full path!

It happens!

Solution 17

My turn!

using (System.Drawing.Image img = Bitmap.FromFile(fileName))
      ... do some manipulation of img ...
      img.Save(fileName, System.Drawing.Imaging.ImageFormat.Jpeg);

Got it on the .Save... because the using() is holding the file open, so I can't overwrite it. Maybe this will help someone in the future.

Solution 18

Same problem I was facing. But in my case, I was trying to save file in C drive and it was not accessible. So I tried it to save in D drive which was fully accessible and I succeeded.

So first check your folders in which you are trying to save. You must have all (read and write) rights for that particular folder.

Solution 19

Simple, create a new instance of Bitmap solves the problem.

string imagePath = Path.Combine(Environment.CurrentDirectory, $"Bhatti{i}.png");
Bitmap bitmap = new Bitmap(image);

Solution 20

I notice that your "jpeg" case is actually:

                format = ImageFormat.Jpeg;

Are you sure that the format is jpeg and not something else?

I'd try:

            case "image/jpg": // or "image/jpeg" !
                format = ImageFormat.Jpeg;

Or check what imageToConvert.MimeType() is actually returning.


Is there any other initialisation you need to do to the MemoryStream object?

Solution 21

  • I had this issue on a test server but not on the live server.
  • I was writing the image to a stream, so it wasn't a permission issue.
  • I'd been directly deploying some of the .dll's to the test server.
  • Deploying the entire solution fixed the issue, so it was probably a weird compilation mismatch

Solution 22

Just to throw another possible solution on the pile, I'll mention the case I ran into with this error message. The method Bitmap.Save would throw this exception when saving an bitmap I had transformed and was displaying. I discovered it would not throw the exception if the statement had a breakpoint on it, nor would it if the Bitmap.Save was preceeded by Thread.Sleep(500) so I suppose there is some sort of resource contention going on.

Simply copying the image to a new Bitmap object was enough to prevent this exception from appearing:

new Bitmap(oldbitmap).Save(filename);

Solution 23

One other cause of this error and that solve my problème is that your application doesn't have a write permission on some directory.

so to complete the answer of savindra :

Here is how you Grant File Access to IIS_IUSERS

To provide access to an ASP.NET application, you must grant access to the IIs_IUSERS.

To grant read, write, and modify permissions to a specific File or Folder

  1. In Windows Explorer, locate and select the required file.

  2. Right click the file, and then click Properties.

  3. In the Properties dialog box, click the Security tab.

  4. On the Security tab, examine the list of users. (If your application is running as a Network Service, add the network service account in the list and grant it the permission.

  5. In the Properties dialog box, click IIs_IUSERS, and in the Permissions for NETWORK SERVICE section, select the Read, Write, and Modify permissions.

  6. Click Apply, and then click OK.

this worked for me in my IIS of windows server 2016 and local IIS windows 10.

Solution 24

We had a similar problem on generating a PDF or resize image using ImageProcessor lib on production server.

Recycle the application pool fix the issue.

Solution 25

If you are trying to save an image to a remote location be sure to add the NETWORK_SERVICE user account into the security settings and give that user read and write permissions. Otherwise it is not going to work.

Solution 26

byte[] bts = (byte[])page1.EnhMetaFileBits; 
using (var ms = new MemoryStream(bts)) 
    var image = System.Drawing.Image.FromStream(ms); 
    System.Drawing.Image img = image.GetThumbnailImage(200, 260, null, IntPtr.Zero);      
    img.Save(NewPath, System.Drawing.Imaging.ImageFormat.Png);

Solution 27

I also get this error because i'm trying to save images with the same name of previous saved images.

Make sure that you don't save images with duplicate name.

Use for thar for example a 'Random' function (How does C#'s random number generator work?) or for example generate a Guid (

Solution 28

in my case, path was wrong

just use this

String path = Server.MapPath("~/last_img.png");//Path

Solution 29

For me I was using the Image.Save(Stream, ImageCodecInfo, EncoderParameters) and apparently this was causing the infamous A generic error occurred in GDI+ error.

I was trying to use EncoderParameter to save the jpegs in 100% quality. This was working perfectly on "my machine" (doh!) and not on production.

When I used the Image.Save(Stream, ImageFormat) instead, the error disappeared! So like an idiot I continued to use the latter although it saves them in default quality which I assume is just 50%.

Hope this info helps someone.

Solution 30

I encountered the problem too. The problem was due to the loading stream being disposed. But I did not dispose it, it was inside .Net framework. All I had to do was use:

image_instance = Image.FromFile(file_name);

instead of


image_instance is of type System.Windows.Forms.PictureBox! PictureBox's Load() disposes the stream which the image was loaded from, and I did not know that.