MSIT.NGif.GifEncoder.WriteLSD C# (CSharp) Method

        private void WriteLSD()
        {
            // logical screen size
            WriteShort(_width);
            WriteShort(_height);
            // packed fields
            _fs.WriteByte(Convert.ToByte(0x80 | // 1   : global color table flag = 1 (gct used)
                                        0x70 | // 2-4 : color resolution = 7
                                        0x00 | // 5   : gct sort flag = 0
                                        _palSize)); // 6-8 : gct size

            _fs.WriteByte(0); // background color index
            _fs.WriteByte(0); // pixel aspect ratio - assume 1:1
        }