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

Agent CK, I liked your extension method and added a string overload, plus I reduced the code for your method:

public static class ImageExtentions
{
    public static ImageCodecInfo GetCodecInfo(this Image img) =>
        ImageCodecInfo.GetImageDecoders().FirstOrDefault(decoder => decoder.FormatID == img.RawFormat.Guid);

    // Note: this will throw an exception if "file" is not an Image file
    // quick fix is a try/catch, but there are more sophisticated methods
    public static ImageCodecInfo GetCodecInfo(this string file)
    {
        using (var img = Image.FromFile(file))
            return img.GetCodecInfo();
    }
}

// Usage:
string file = @"C:\MyImage.tif";
string description = $"Image format is {file.GetCodecInfo()?.FormatDescription ?? "unknown"}.";
Console.WriteLine(description);