Image.Save() throws exception "Value cannot be null./r/nParameter name: encoder"

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I am getting "Value cannot be null.\r\nParameter name: encoder" error while saving a Bitmap image using RawFormat.
Sample code:

C#

class Program
    {
        static void Main(string[] args)
        {
            try
            {
                var image = new System.Drawing.Bitmap(500, 400);
                var stream = new MemoryStream();
                image.Save(stream, ImageFormat.Bmp);
            }
            catch (Exception exp)
            {
                Console.WriteLine(exp.ToString());
            }
        }
    }

The RawFormat doesn't exist in the existing list of ImageEncoders as below code returns null.

C#

var imageCodecInfo = ImageCodecInfo.GetImageEncoders().FirstOrDefault(codec => codec.FormatID == image.RawFormat.Guid);

Note: The image could be any type(JPEG, BMP, PNG) etc. Image.Save() should work on image.RawFormat.
RawFormat is not Bitmap type. If I Change image.RawFormat to ImageFormat.Bmp, the save operation succeeds.

Referred below links but found nothing for making it independent of image type.
http://stackoverflow.com/questions/9073619/image-save-crashing-value-cannot-be-null-r-nparameter-name-encoder
Any suggestions are welcome.

Posted 11-Aug-14 1:39am

Praveen Raghuvanshi

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El_Codero · Answer 1 · 2014-08-11T04:10:00

Not easy to help without more details.

A few checkpoints which I would investigate:

- what kind of raw format (sony raw image, canon, ...)
- Are you using wpf? It uses more framework build-in drawing options like the BitmapDecoder
- WIC code pack installed?

http://www.obviousidea.com/windows-software/wic/[^]

Example code I would try with:

C#

BitmapDecoder bitmapDecoder = BitmapDecoder.Create(new Uri(sourceFilePath),
BitmapCreateOptions.DelayCreation, BitmapCacheOption.None);
BitmapEncoder bitmapEncoder = new BmpBitmapEncoder();
bitmapEncoder.Frames.Add(bitmapDecoder .Frames[0]);
Stream memoryStream = new MemoryStream();
bmpEnc.Save(memoryStream );
Image srcImage = Bitmap.FromStream(memoryStream);

May it'll help you. Regards

Mike Meinz · Answer 2 · 2014-08-11T05:06:00

You are using the Image.Save[^] method with Stream and ImageFormat parameters.

Image.RawFormat[^] is not a value it is a property that holds the image format.

The image format can only be one of the values as described in the documentation for the System.Drawing.ImageFormat property[^].

There are other variations of the Image.Save [^] method that will accept and call custom encoders.

Image.Save() throws exception "Value cannot be null./r/nParameter name: encoder"

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