byte[,] imgdata = new byte[128, 32]; // Contains the palette used on each pixel from x0y0 to x128y64
        byte[] data;
        int[] positions = new int[] { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };

        public void load4bpp(int pos = 0)
        {

            for (int j = 0; j < 4; j++)
            {
                for (int i = 0; i < 16; i++)
                {
                    int offset = (hexOffset + (pos * 0x800)) + ((j * 32) * 16) + (i * 32);
                    for (int x = 0; x < 8; x++)
                    {
                        for (int y = 0; y < 8; y++)
                        {
                            byte tmpbyte = 0;

                            if ((data[offset + (x * 2)] & positions[y]) == positions[y])
                            {
                                tmpbyte += 1;
                            }
                            if ((data[offset + (x * 2) + 1] & positions[y]) == positions[y])
                            {
                                tmpbyte += 2;
                            }

                            if ((data[offset + 16 + (x * 2)] & positions[y]) == positions[y])
                            {
                                tmpbyte += 4;
                            }
                            if ((data[offset + 16 + (x * 2) + 1] & positions[y]) == positions[y])
                            {
                                tmpbyte += 8;
                            }
                            imgdata[y+(i*8), x+(j*8)] = tmpbyte;

                        }
                    }
                }
            }

        }

//To set create the image :
for (int x = 0;x<128;x++)
{
 for (int y = 0; y < 32; y++)
   {
     image.SetPixel(x, y, palette[imgdata[x,y]]);
   }
}