PHP - I Want To Make Transparent Background Here

I have the following I use for uploading images, but I am having an issue with transparent background png images, they all get changed from transparent background to a black background. After doing some hunting around I see I neet to use imagealphablending and imagesavealpha to keep the trransparency, but it doesnt seem to be working I still get the black backgrounds, any ideas?

Here is the script

Code: [Select]
<?php
// Process new logo image
if ($_FILES['logo']['tmp_name']&&$_FILES['logo']['tmp_name']!="") {  
// set memory limit for image
ini_set("memory_limit","32M");
// Check file extension
$checkfile=$_FILES['logo']['name'];
$ext=substr($checkfile, -3);
// Redirect if not correct image type
if (!in_array($ext, array('jpg', 'JPG', 'gif', 'GIF', 'png', 'PNG'))) {
header("Location: ../control_index.php?sponsors=error1");
// Close database connection
mysql_close($link);
exit ();
}
// Create logo image (300px wide)
$file=$_FILES['logo']['tmp_name'];
list($width, $height)=getimagesize($file);
// Scale to width
$main_width=300;
$main_height=$height*($main_width/$width);

if ($ext=="jpg"||$ext=="JPG") {
$image=imagecreatefromjpeg($file);
$newname="sponsor".time().".jpg";
}
if ($ext=="gif"||$ext=="GIF") {
$image=imagecreatefromgif($file);
$newname="sponsor".time().".gif";
}
if ($ext=="png"||$ext=="PNG") {
$image=imagecreatefrompng($file);
$newname="sponsor".time().".png";
}
// Create main image file
$main_image=imagecreatetruecolor($main_width, $main_height);
imagecopyresampled($main_image, $image, 0, 0, 0, 0, $main_width, $main_height, $width, $height);
$cp_file="../images/sponsors/".$newname;
$site_file="../../images/sponsors/".$newname;
if ($ext=="jpg"||$ext=="JPG") {
imagejpeg($main_image, $cp_file, 100);
imagejpeg($main_image, $site_file, 100);
}
if ($ext=="gif"||$ext=="GIF") {
imagegif($main_image, $cp_file, 100);
imagegif($main_image, $site_file, 100);
}
if ($ext=="png"||$ext=="PNG") {
// Turn off alpha blending and set alpha flag
imagealphablending($main_image, false);
imagesavealpha($main_image, true);
imagepng($main_image, $cp_file, 9);
imagepng($main_image, $site_file, 9);
}
?>

So I'm new to PHP GD, I cant understand why the PNG image will not go transparent, it's just showing a white background.   Could anyone help me out with this?   Spoiler

Hey all.  I'm getting down the basics of the GD Library's image creation processes.  I'm trying to test out creating png images.  However, where there should be transparency there is a black background.  Here's my code mostly based on the image tutorial found here at phpfreaks.

Code: [Select]
<?php
// font
$font = 'c:\windows\fonts\arial.ttf';
$fontsize = 12;

// array of quotes
$quotes = array(
"I like pie.",
"Surf's Up.",
"Smoke em if you got em.",
"Game on.",
"I need TP for my bunghole.");

// select quote
$pos = rand(0,count($quotes)-1);
$quote = $quotes[$pos];

// image
$image = imagecreatefrompng('quote.png');

$white = imagecolorallocate($image, 255, 255, 255);
$black = imagecolorallocate($image, 0, 0, 0);
imagettftext($image, 11, 0, 107, 32, $black, $font, $quote);
imagettftext($image, 11, 0, 105, 30, $white, $font, $quote);


// tell the browser that the content is an image
header('Content-type: image/png');
// output image to the browser
imagepng($image);

// delete the image resource 
imagedestroy($image);
?>
Cheers all, thanks!   

I am trying to copy an image into another image.

Code: [Select]
$im = imagecreatefrompng("/oldimg.png"); //this is a semi-transparent image where I want the new image to be copied

imagealphablending($im, 1); //this seems to remove the black background

header('Content-type: image/png'); //outputs old image with a transparent background (YAY!)
imagepng($im);

imagecopy($im, $newimage, 32, 0, 0, 0, 32, 32); //I want to replace a part of the old image with a new semi-transparent image

header('Content-type: image/png'); //outputs image with a black background (noooooooooo!)
imagepng($im);

Can anyone help me?

Hi all,   Any idea what Pinterest uses to make the background move please? I searched everywhere and cannot find the answer:   https://www.pinterest.com/   I need the same type of background movement + popup on my site, it looks so nice!     Thank you,   Ben