Image does not convert to Bitmap

Question

I am currently experiencing an issue where an image cannot be converted to Bitmap.

This is the code in question:

private void btnPicture_Click(object sender, EventArgs e)
        {
            OpenFileDialog opFile = new OpenFileDialog();
            opFile.Title = "Choose a picture!";
            opFile.Filter = "jpg files (*.jpg)|*.jpg|All files (*.*)|*.*";

            string appPath = Path.GetDirectoryName(Application.ExecutablePath);
            if (Directory.Exists(appPath) == false)
            {
                Directory.CreateDirectory(appPath);
            }

            if (opFile.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    Character.imageName = opFile.SafeFileName;
                    Stream stream = opFile.OpenFile(); //<------ This is the line in question
                    Bitmap toResize = new Bitmap(stream);

                    Image characterImage = ResizeImage(toResize, 200, 306);

                    imgCharacter.Image = characterImage;
                    characterImage.Save("Images/" + Character.imageName);
                }
                catch (Exception exp)
                {
                    MessageBox.Show("Please select a picture, exception code: " + exp.Message);
                }
            }
            else
            {
                opFile.Dispose();
            }
        }

Now basically this code works with every single image that I have tried, except 1. A single picture that my friends tried to upload will crash with the following error: Parameter is not valid.

What I have tried:

• First, the friend sent me the image in question. I downloaded it and faced the same problem.
• Then I had the friend send me other images that worked on his machine, these still worked.
• Next, I opened the image in question in Paint, "saved as" the picture to any folder, then it worked. In the process, I received a warning that saving the image this way may result in transparency loss.
• To check if transparency was the problem I had downloaded a "transparent" picture off the internet to check if that is the problem - the picture would load correctly.
• Lastly, I had searched for the exact same picture on the internet and tried to download it exactly the same way my friend did, I did not get the error.
• To make sure the image was not corrupted I asked the friend to download it once again and sent to me - the error would still occur.
• I ran the debugger line by line to pinpoint the exact line of code that crashes. I have no idea what could be the cause there.

Link to the image: https://cdn.discordapp.com/attachments/413040202307731466/713873776143499294/babar1.jpg

I tried to find help online but could not find anything relevant so here I am, if there is anything particularly special to this picture (or a group of pictures) that I do not know about, please forgive, I am not a graphics designer in any way, shape or form.

Have a nice day.

Answer 1

I looked at the image you provided named "barbar1.jpg" in a hex editor and can see RIFF WEBPVP8 markers at the beginning. This means the image is not a JPG file it is a WEBP file.

https://en.wikipedia.org/wiki/WebP

The error you are getting is when initializing the new Bitmap from a stream. Bitmap class only supports BMP, GIF, EXIF, JPG, PNG and TIFF.

Microsoft Paint supports WEBP which is why you are able to open it and view it. Microsoft and other image viewers ignore the file extension and parse the image based on the format of the file data itself. This is why you are able to rename the file to PNG, JPG, BMP, etc and it will still be readable by Paint.