public function gf()
{
$arguments = func_get_args();
if (func_num_args() === 1 && ($image = $arguments[0]) instanceof ImageContract) {
$bytesPerRow = $image->width();
$byteCount = $fieldCount = $bytesPerRow * $image->height();
return $this->command('GF', 'A', $byteCount, $fieldCount, $bytesPerRow, $image->toAscii());
}
array_unshift($arguments, 'GF');
return call_user_func_array([$this, 'command'], $arguments);
}