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<?php
$imgfile='peng.jpg';
$x=0.5;
list($width,$height)=getimagesize($imgfile);
$newwidth=$width*$x;
$newheight=$height*$x;
$thumb=imagecreatetruecolor($newwidth,$newheight);
$source=imagecreatefromjpeg($imgfile);
imagecopyresized($thumb,$source,0,0,0,0,$newwidth,$newheight,$width,$height);
header('content-type:image/jpeg');
imagejpeg($thumb);
?>

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Warning: imagecreatetruecolor() [function.imagecreatetruecolor]: Invalid image dimensions in D:\www\imagebiger.php on line 7

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Warning: imagecopyresized(): supplied argument is not a valid Image resource in D:\www\imagebiger.php on line 9

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