即时缩略图PHP

Question

我想出了这个:

<?php 

$dir = $_GET['dir'];

header('Content-type: image/jpeg'); 

$create = imagecreatetruecolor(150, 150); 
$img = imagecreatefromjpeg($dir); 
imagecopyresampled($create, $img, 0, 0, 0, 0, 150, 150, 150, 150); 

imagejpeg($create, null, 100); 

?>

它通过访问:

http://domain.com/image.php?dir=thisistheimage.jpg

哪个工作正常...但输出很糟糕:

替代文字http://i47.tinypic.com/119s47a.jpg

有人可以修复我的代码为150 x 150覆盖黑色区域的图像...

谢谢.

解:

<?php 

$dir = $_GET['dir'];

header('Content-type: image/jpeg'); 

list($width, $height) = getimagesize($dir);

$create = imagecreatetruecolor(150, 150); 
$img = imagecreatefromjpeg($dir); 

$newwidth = 150;
$newheight = 150;

imagecopyresized($create, $img, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

imagejpeg($create, null, 100); 

?>

Answer 1

用途imagecopyresized:

$newwidth = 150;
$newheight = 150;
imagecopyresized($create, $image, 0, 0, 0, 0, $newwidth, $newheight, $oldwidth, $oldheight);