Combining images in PHP while retaining transparency - php

Question

Have a look here: http://tyilo.jbusers.com/PNG/progress.php?l=100&p=20
I want to remove the white-thingy at the end of the blue part, but I have tried many different things that didn't work.
If needed the pngs can be found in http://tyilo.jbusers.com/PNG/ folder (http://tyilo.jbusers.com/PNG/Empty.png)
header('Content-type: image/png');
echo imagepng(progressbar($_GET['l'], $_GET['p']));
function progressbar($length, $percentage)
{
$length = round($length / 2) * 2;
$percentage = min(100, max(0, $percentage));
if($length > 0)
{
$bar = imagecreate($length, 14);
$empty = imagecreatefrompng('Empty.png');
$fill = imagecreatefrompng('Fill.png');
$lempty = imagecreatefrompng('LeftEmpty.png');
$lfill = imagecreatefrompng('LeftFill.png');
$rempty = imagecreatefrompng('RightEmpty.png');
$rfill = imagecreatefrompng('RightFill.png');
$emptycaplength = min(7, $length / 2); //5
imagecopy($bar, $lempty, 0, 0, 0, 0, $emptycaplength, 14);
imagecopy($bar, $rempty, $length - $emptycaplength, 0, 7 - $emptycaplength, 0, $emptycaplength, 14);
if($length > 14)
{
imagecopyresized($bar, $empty, 7, 0, 0, 0, $length - 14, 14, 1, 14);
}
$filllength = round(($length * ($percentage / 100)) / 2) * 2;
$fillcaplength = min(7, $filllength / 2);
imagecopy($bar, $lfill, 0, 0, 0, 0, $fillcaplength, 14);
imagecopy($bar, $rfill, $filllength - $fillcaplength, 0, 7 - $fillcaplength, 0, $fillcaplength, 14);
if($filllength > 14)
{
imagecopyresized($bar, $fill, 7, 0, 0, 0, $filllength - 14, 14, 1, 14);
}
return $bar;
}
else
{
return false;
}
}

Answer 1

try using imagecreatetruecolor() to create your image.
http://www.php.net/manual/en/function.imagecreatetruecolor.php

Answer 2

I think you need to set the Alpha blend of the image...
imagealphablending($cropimg, false);
imagesavealpha($cropimg, true);
I've also found that it helps to set the Color Allocation.
imageColorAllocate ($cropimg, 0, 0, 0);
I think you will need to call those three functions on all your filled images. Sorry for the incomplete answer, I'm in a rush but thought I'd throw you a bone.