Accord.Imaging.Formats.PNMCodec.ReadImageFrame C# (CSharp) Method

        private static Bitmap ReadImageFrame(Stream stream, PNMImageInfo imageInfo)
        {
            try
            {
                // decode PNM image depending on its format
                switch (imageInfo.Version)
                {
                    case 5:
                        return ReadP5Image(stream, imageInfo.Width, imageInfo.Height, imageInfo.MaxDataValue);
                    case 6:
                        return ReadP6Image(stream, imageInfo.Width, imageInfo.Height, imageInfo.MaxDataValue);
                }
            }
            catch
            {
                throw new ArgumentException("The stream does not contain valid PNM image.");
            }

            return null;
        }