PHP GD 縮放圖片大小 imagecopyresampled

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1. <?php
   
2. // File and new size
   
3. $filename = 'test.jpg';
   
4. $percent = 0.5;
   
5. 
   
6. // Content type
   
7. header('Content-Type: image/jpeg');
   
8. 
   
9. // Get new sizes
   
10. list($width, $height) = getimagesize($filename);
    
11. $newwidth = $width * $percent;
    
12. $newheight = $height * $percent;
    
13. 
    
14. // Load
    
15. $thumb = imagecreatetruecolor($newwidth, $newheight);
    
16. $source = imagecreatefromjpeg($filename);
    
17. 
    
18. // Resize
    
19. imagecopyresampled($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
    
20. 
    
21. // Output
    
22. imagejpeg($thumb);
    
23. ?>

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使用 imagecopyresampled 的圖片質量比 imagecopyresized 要好得多