PHP - Gd Transparent Cutout

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

session_start(); 
$text = rand(10000,99999); 
$_SESSION["vercode"] = $text; 
$height = 25; 
$width = 65; 
  
$image_p = imagecreate($width, $height); 
$black = imagecolorallocate($image_p, 255, 255, 255); 
$white = imagecolorallocate($image_p, 0, 0, 0); 
$font_size = 14; 
  
imagestring($image_p, $font_size, 5, 5, $text, $white); 
imagejpeg($image_p, null, 80); 

The code above creates an image with white background. How to change it to create transparent background?

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);
}
?>

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'm wondering if the GD library is capable of coloring ONLY the non-transparent areas in an image. I had this image white, black, and every other color under the moon, but could only get GD to color the entire canvas (width and height) of the image with an opacity over it. I'm merging many layers on top of each other so I can't afford to color the entire square and lower the opacity and do some weird multiply stuff.     That's the image above. Then I have some lineart, markings, eye color, etc. So I had all my possible colors white areas that I layer on top of eachother. I want to color the entire non-transparent areas with a color (dynamic).. so I can't just color it in Photoshop and then upload it or else I would literally have millions of possibilities for every single color and shade..   Thanks for any help. I was trying to go with ImageMagick if GD isn't capable, but I can't even get that downloaded in my Wamp. I'm using 64 bit Wamp so I have no idea if that does something or whatever. I can get it installed on my computer and run it via command line, but I can't get it to work and render images in my Wamp files... can't ever find a .dll that works.