Hi All.
I am having a nightmare with a script that allows customers to upload image files to use in designing their own t-shirts, etc with a maximum size of 3000 x 3000 pixels. The script takes their original uploaded image and creates a medium sized thumbnail, and a small thumbnail. The script works fine for JPG and GIF files up to the maximum allowed size (3000x3000). If the customer uploads a larg-ish PNG file (greater than roughly 1500 x 1500 pixels) the script dies with an Internal Error 500 at the point I call the GD function imagecreatefrompng() to create a thumbnail of the image.
I have done all of the obvious thing like increasing the PHP memory limit (which is now set to 128M). My host has confirmed that they do restrict memory usage on the Apache side of things too but they have upped my allowed memory to around 90MB for testing but the problem persists. When I use memory_get usage() just before the imagecreatefrompng it reports memory usage as around 4MB. According to the forumlae I have seen around the net I have calculated that I should only need around 20MB of RAM to open a PNG image of 3000 x 3000 pixels.
Is there something else I can do to get this working or am I faced with some sort of PHP/GD bug?
Server specs:
5.1.6 (Zend: 2.1.0)
Apache/2.2.3 (Fedora)
MySQL 5.0.27
GD version: bundled (2.0.28 compatible)
The area in the script where the error occurs looks like this:
$extension = substr($file_details['name'], strrpos($file_details['name'], '.') + 1);
if ($extension == 'jpg' || $extension == 'jpeg' || $extension == 'png' || $extension == 'gif'){
if (!file_exists($uploads_dir_path_med.'/'.$large_prefix.$file_details['name'])){
if ($extension == 'jpg' || $extension == 'jpeg'){
$image = imagecreatefromjpeg($uploads_dir_path_lrg.'/'.$file_details['name']);
$image_width = imagesx($image);
$image_height = imagesy ($image);
}
else if ($extension == 'png'){
list($image_width, $image_height) = getimagesize($uploads_dir_path_lrg.'/'.$file_details['name']);
//script dies with error 500 at the next line
$image = imagecreatefrompng($uploads_dir_path_lrg.'/'.$file_details['name']);
}
else if ($extension == 'gif'){
$image = imagecreatefromgif($uploads_dir_path_lrg.'/'.$file_details['name']);
$image_width = imagesx($image);
$image_height = imagesy ($image);
}
$maxwidth = 200;
$maxheight = 200;
$x_ratio = $maxwidth / $image_width;
$y_ratio = $maxheight / $image_height;
if( ($image_width <= $maxwidth) && ($image_height <= $maxheight) ){
$tn_width = $image_width;
$tn_height = $image_height;
}
elseif (($x_ratio * $image_height) < $maxheight){
$tn_height = ceil($x_ratio * $image_height);
$tn_width = $maxwidth;
}
else{
$tn_width = ceil($y_ratio * $image_width);
$tn_height = $maxheight;
}
$output = imagecreatetruecolor ($tn_width, $tn_height);
imagealphablending($output, false);
imagecopyresampled ($output,$image,0,0,0,0,$tn_width, $tn_height,$image_width,$image_height);
imagesavealpha($output, true);
if ($extension == 'jpg'){
imagejpeg($output,$uploads_dir_path_med.'/'.$large_prefix.$file_details['name']);
}
else if ($extension == 'png'){
imagepng($output,$uploads_dir_path_med.'/'.$large_prefix.$file_details['name']);
}
else if ($extension == 'gif'){
imagegif($output,$uploads_dir_path_med.'/'.$large_prefix.$file_details['name']);
}
imagedestroy ($image);
imagedestroy ($output);
}
if (!file_exists($uploads_dir_path_thmb.'/'.$thmb_prefix.$file_details['name'])){
if ($extension == 'jpg' || $extension == 'jpeg'){
$image = imagecreatefromjpeg($uploads_dir_path_med.'/'.$large_prefix.$file_details['name']);
}
else if ($extension == 'png'){
$image = imagecreatefrompng($uploads_dir_path_med.'/'.$large_prefix.$file_details['name']);
}
else if ($extension == 'gif'){
$image = imagecreatefromgif($uploads_dir_path_med.'/'.$large_prefix.$file_details['name']);
}
$maxwidth = 69;
$maxheight = 90;
$image_width = imagesx($image);
$image_height = imagesy ($image);
$x_ratio = $maxwidth / $image_width;
$y_ratio = $maxheight / $image_height;
$x_ratio = $maxwidth / $image_width;
$y_ratio = $maxheight / $image_height;
if( ($image_width <= $maxwidth) && ($image_height <= $maxheight) ){
$tn_width = $image_width;
$tn_height = $image_height;
}
elseif (($x_ratio * $image_height) < $maxheight){
$tn_height = ceil($x_ratio * $image_height);
$tn_width = $maxwidth;
}
else{
$tn_width = ceil($y_ratio * $image_width);
$tn_height = $maxheight;
}
$output = imagecreatetruecolor ($tn_width, $tn_height);
$grey = imagecolorallocate($output,128,128,128);
imagefilledrectangle($output, 0, 0, $tn_width, $tn_height, $grey);
imagecopyresampled ($output,$image,0,0,0,0,$tn_width, $tn_height,$image_width,$image_height);
$output_final = imagecreatetruecolor (69, 90);
$white = imagecolorallocate($output_final,255,255,255);
imagefilledrectangle($output_final, 0, 0, 69, 90, $white);
imagecopy ($output_final,$output,(69/2)-($tn_width/2),(90/2)-($tn_height/2),0,0,$tn_width, $tn_height);
if ($extension == 'jpg'){
imagejpeg($output_final,$uploads_dir_path_thmb.'/'.$thmb_prefix.$file_details['name']);
}
else if ($extension == 'png'){
imagepng($output_final,$uploads_dir_path_thmb.'/'.$thmb_prefix.$file_details['name']);
}
else if ($extension == 'gif'){
imagegif($output_final,$uploads_dir_path_thmb.'/'.$thmb_prefix.$file_details['name']);
}
imagedestroy ($image);
imagedestroy ($output);
imagedestroy ($output_final);
}
//add image details to DB
$sql = "
INSERT INTO cd_user_uploaded_images (customer_id,image_filename,image_width,image_height,no_of_colours,date_added,mime_type,undersize)
VALUES ('".$_SESSION['customer_id']."','".$file_details['name']."','".(int)$file_details['width']."','".(int)$file_details['height']."','no_colors',NOW(),'".$file_details['type']."','".(int)$undersize."')
";
$db->Execute($sql);
}
header( "Location: ".HTTP_SERVER. "/index.php?main_page=custom_designer&products_id=".$products_id."&is=u&ht=0".$size_warn."&scs=1");
exit();
Any help or advise would be greatly appreciated as I have run out of ideas now....
Thanks.
