header("Content-type: image/jpeg");$file = "10k.jpg";$percent = 1.5; //图片压缩比list($width, $height) = getimagesize($file); //获取原图尺寸//缩放尺寸$newwidth = $width * $percent;$newheight = $height * $percent;$src_im = imagecreatefromjpeg($file);$dst_im = imagecreatetruecolor($newwidth, $newheight);imagecopyresized($dst_im, $src_im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);imagejpeg($dst_im); //输出压缩后的图片imagedestroy($dst_im);imagedestroy($src_im);原文：http://www.cnblogs.com/sanwenyu/p/4563915.html