Discuz修复PNG透明图片生成缩略图时背景变黑的BUG

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解决手机版png透明图片黑底问题

打开 source\class\class_image.php

找到这个函数（所有修改都在这个函数内）

1. function Thumb_GD() {

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下边找到

1. $copy_photo = imagecreatetruecolor($this->imginfo['width'], $this->imginfo['height']);
   
2. imagecopy($copy_photo, $attach_photo , 0, 0, 0, 0, $this->imginfo['width'], $this->imginfo['height']);
   
3. $attach_photo = $copy_photo;

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改为

1. if($this->imginfo['mime'] != 'image/png') {
   
2.         $copy_photo = imagecreatetruecolor($this->imginfo['width'], $this->imginfo['height']);
   
3.         imagecopy($copy_photo, $attach_photo , 0, 0, 0, 0, $this->imginfo['width'], $this->imginfo['height']);
   
4.         $attach_photo = $copy_photo;
   
5. }

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找到（三处）

1. $thumb_photo = imagecreatetruecolor

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下边添加

1. if($this->imginfo['mime'] == 'image/png') {
   
2.         imagealphablending($thumb_photo, false);
   
3.         imagesavealpha($thumb_photo, true);
   
4. }

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ysx24

史诗级攻略，修复我头疼一年多的顽疾，感谢