Find image format using Bitmap object in C#

Question

I am loading the binary bytes of the image file hard drive and loading it into a Bitmap object. How do i find the image type[JPEG, PNG, BMP etc] from the Bitmap object?

Answer 1

Not to bother to on old topic, but to complete this discussion, I want to share my way to query all image formats, known by windows.

using System.Diagnostics;
using System.Drawing;
using System.Drawing.Imaging;

public static class ImageExtentions
{
    public static ImageCodecInfo GetCodecInfo(this System.Drawing.Image img)
    {
        ImageCodecInfo[] decoders = ImageCodecInfo.GetImageDecoders();
        foreach (ImageCodecInfo decoder in decoders)
            if (img.RawFormat.Guid == decoder.FormatID)
                return decoder;
        return null;
    }
}

Now you can use it as an an image extension as shown below:

public void Test(Image img)
{
    ImageCodecInfo info = img.GetCodecInfo();
    if (info == null)
        Trace.TraceError("Image format is unkown");
    else
        Trace.TraceInformation("Image format is " + info.FormatDescription);
}