Discuz修复PNG透明图片生成缩略图时背景变黑的BUG
解决手机版png透明图片黑底问题<br /><br />打开 source\class\class_image.php<br /><br />找到这个函数（所有修改都在这个函数内）<br /><ol><li>function Thumb_GD() {</ol>下边找到<ol><li>$copy_photo = imagecreatetruecolor($this->imginfo['width'], $this->imginfo['height']);<br /><li>imagecopy($copy_photo, $attach_photo , 0, 0, 0, 0, $this->imginfo['width'], $this->imginfo['height']);<br /><li>$attach_photo = $copy_photo;</ol>改为<br /><ol><li>if($this->imginfo['mime'] != 'image/png') {<br /><li> $copy_photo = imagecreatetruecolor($this->imginfo['width'], $this->imginfo['height']);<br /><li> imagecopy($copy_photo, $attach_photo , 0, 0, 0, 0, $this->imginfo['width'], $this->imginfo['height']);<br /><li> $attach_photo = $copy_photo;<br /><li>}</ol>找到（三处）<ol><li>$thumb_photo = imagecreatetruecolor</ol>下边添加<ol><li>if($this->imginfo['mime'] == 'image/png') {<br /><li> imagealphablending($thumb_photo, false);<br /><li> imagesavealpha($thumb_photo, true);<br /><li>}</ol><br />透明<em>, </em>图片<em>, </em>class<em>, </em>这个<em>, </em>函数 史诗级攻略，修复我头疼一年多的顽疾，感谢
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