PHP缩略图等比例无损压缩，可填充空白区域补充色
col = imagecolorat ($im, $x, $y);
fwrite ($f, pack (''V'', $col), 3);
}
for ($i = 0; $i < $numpad; ++$i)
fwrite ($f, pack (''C'', 0));
}
fclose ($f);
return true;
}
?>
fwrite ($f, pack (''V'', $col), 3);
}
for ($i = 0; $i < $numpad; ++$i)
fwrite ($f, pack (''C'', 0));
}
fclose ($f);
return true;
}
?>