[RESOLVED] Can't create thumbs. Memory limits?

[NathanaelCulver]

I've got some code that auto-generates thumbnails. It works fine on my local system, but on my online site larger images (ca. 1mb and bigger) often throw errors like the following:

Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: gd-jpeg: JPEG library reports unrecoverable error: in /hermes/web07d/b1074/moo.nathanaelculver/accardi/canon/layout.php on line 88

My actual code looks like this:

<?php
  $img = imagecreatefromjpeg( $imagefile );
  $width = imagesx( $img );
  $height = imagesy( $img );
  $new_height = $thumbHeight;
  $new_width = floor ( ($thumbHeight / $height) * $width );
  $tmp_img = imagecreatetruecolor( $new_width, $new_height );
  imagecopyresized( $tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height );
  imagejpeg( $tmp_img, $thumbdir.basename($imagefile));
  imagedestroy( $tmp_img );
?>

I presume I'm bumping into memory limits. Any way around this? Unfortunately, a large portion of the images on my site are a meg or more in size.

[EDIT: Found the other error message. Also reformatted message for clarity.]

Fatal error: Allowed memory size of 18874368 bytes exhausted (tried to allocate 14720 bytes) in /hermes/web07d/b1074/moo.nathanaelculver/accardi/site/Themes/Board-n-Parchment/layout.php on line 173

Line 173 is

$img = imagecreatefromjpeg( $imagefile );

--Nathanael

[NogDog]

The memory needed by the PHP GD functions to work on an image is only indirectly related to the image file size. It is, instead, directly related to the image dimensions, as it creates a bitmap of the image in memory, using 4 bytes per pixel. So you can get a pretty accurate guess as to the required memory by multiplying the width height 4 bytes.

So anyway, if your PHP configuration allows it, you can use the memory_limit setting to change the max memory that can be allocated to your script (e.g. via the [man]ini_set/man function). Also, if working with mulitple image resources, be sure to destroy them when you no longer need them in your script.

[NathanaelCulver]

Thanks, NogDog.

set_ini worked.

--Nathanael