Hi,

 

I've got the following script which grabs an image uploaded through Flash, stores on the server and generates a thumbnail.

 

I'm using GD imagecopyresize to generate the thumbnails which is working fine except that the resized result always comes out black? Any ideas why this could be?

 

<?php
// Set local PHP vars from the POST vars sent from flash
$todayDate = $_POST['todayDate'];
$Name = $_POST['Name'];
$Email = $_POST['Email'];
$filename = $_FILES['Filedata']['name'];	
$filetmpname = $_FILES['Filedata']['tmp_name'];	
$fileType = $_FILES["Filedata"]["type"];
$fileSizeMB = ($_FILES["Filedata"]["size"] / 1024 / 1000);

// Place file on server, into uploadimages
move_uploaded_file($_FILES['Filedata']['tmp_name'], "uploadimages/".$filename);

// Logfile
$myFile = "logFile.txt";
$fh = fopen($myFile, 'a') or die("can't open file");
$stringData = "\n\ntodayDate: $todayDate  \n Name: $Name \n Email: $Email \n ssid: $ssid \n FileName: $filename \n TmpName: $filetmpname \n Type: $fileType \n Size: $fileSizeMB MegaBytes";
fwrite($fh, $stringData);
fclose($fh);
// End log file edit

// load image and get image size
$img = imagecreatefromjpeg( "uploadimages/.$filename" );
$width = imagesx( $img );
$height = imagesy( $img );

// set thumbnail size
$new_width = 100;
$new_height = 100;

// create a new tempopary image
$tmp_img = imagecreatetruecolor( $new_width, $new_height );

// copy and resize old image into new image 
imagecopyresized( $tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height );

// save thumbnail into a new file in uploadthumbs
imagejpeg( $tmp_img, "uploadthumbs/$filename" );

?>

You're definitely using a jpeg image?

Try changing this line:

$img = imagecreatefromjpeg( "uploadimages/.$filename" );

to:

$img = imagecreatefromjpeg( "uploadimages/$filename" );

GD does not deal with PNG/GIF images with transparent background very well by default, at least it is not as easy to use as Imagmagick. and yes GD will fill the background with black.

 

I used the script from

http://mediumexposure.com/smart-image-resizing-while-preserving-transparency-php-and-gd-library/

 

to resize images using GD as not all hosting servers got imagmagick

 

That script can deal with transparent background properly

 

 

 

Try changing this line:

$img = imagecreatefromjpeg( "uploadimages/.$filename" );

to:

$img = imagecreatefromjpeg( "uploadimages/$filename" );

Try changing this line:

$img = imagecreatefromjpeg( "uploadimages/.$filename" );

to:

$img = imagecreatefromjpeg( "uploadimages/$filename" );

 

Didn't see that! Makes sense, imagecreatetruecolor() makes a black image and then you'd be resizing null into it.

That's great guys, yeah it was the period proceeding the $filename var. Coming out full colour now.

 

Thanks!