[RESOLVED] Problem With imagecreatefromjpeg

[912bliss]

Hi
The following code works on my computer but when i load it onto the server it works until it gets to imagecreatefromjpeg line then the program stops , the folders are all 0777
What i am trying to do is to scan through a folder and resize all images in that folder and move the resized images to a different folder

Any Idea what the problem could be

<?php

$dir  = 'test';

$files2 = scandir($dir, 1);
$count=count($files2)-2;
for($i=0; $i<$count;$i++)
		{

$uploadedfile ="test/".$files2[$i];

$resizedfile="pic/".$files2[$i];


list($width,$height)=getimagesize($uploadedfile);
		$newwidth=330;
$newheight=($height/$width)*280;
if(($height/$width)<1.3){$newheight=($height/$width)*340;}
$tmp=imagecreatetruecolor($newwidth,$newheight);

$src =imagecreatefromjpeg($uploadedfile);


imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);



imagejpeg($tmp,$resizedfile,90);

	}

?>

[NogDog]

Start by adding the following to the top of the file so that hopefully we know why it's stopping.

<?php
ini_set('display_errors', 1); // change to 0 for production version
error_reporting(E_ALL);

[912bliss]

I was getting the following error ,
Allowed memory size of 52428800 bytes exhausted (tried to allocate 12800 bytes) in createimage.php on line 48

i increase the memory limit from 24m to 50 m but still the same error , then increased it to 100m and it worked .

Why does imagecreatefromjpeg use that amount of memory just for an 240K image

Thanks for the help

[NogDog]

Because the function creates a bitmap of the image in memory, so the memory is only indirectly related to the compressed file size achieved by any particular image format (e.g. JPEG). It is directly related to the number of pixels, needing 4 bytes per pixel for a truecolor image. So multiply the width times the height and multiply that by 4, and you have the number of bytes required.