PHP GD Image transparency

[lilgezuz]

I have the below code that outputs my image correctly expect it puts a black background in it, instead of keeping it transparent.  I'm tried using imagealphablending and couldn't get it to work.  What should I use to get it to work correctly and where should I put it.

 

$src = imagecreatefrompng($target);
echo $scr;
list($width,$height)=getimagesize($target);
$newwidth=54; // new width of image
$newheight=54;
$tmp=imagecreatetruecolor($newwidth,$newheight);
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
$image1 = imagecreatefrompng('Surround.png');
imagecopymerge($image1, $tmp, 5, 5, 0, 0, 54, 54, 100);

 

This is what my gd script output looks like, the black needs to be transparent

 

[joel24]

http://php.net/manual/en/function.imagecolortransparent.php

[lilgezuz]

http://php.net/manual/en/function.imagecolortransparent.php

 

Thats to define a color as a transparent I want to preserve the transparency of the orginal image

[joel24]

//wrote this script almost 2 years ago, hope it helps.
            $newImg = imagecreatetruecolor($newWidth, $newHeight);
            imagealphablending($newImg, false);
            imagesavealpha($newImg,true);
            $transparent = imagecolorallocatealpha($newImg, 0, 0, 0, 0);
            imagefilledrectangle($newImg, 0, 0, $newWidth, $newHeight, $transparent);
            imagecolortransparent($newImg, $transparent);

[lilgezuz]

Thats not working for me either, I'm not sure how to make it work with my exisiting code.  I tried using it on the $tmp and $image1 and still came out with a black background

[lilgezuz]

So could anyone help me with this?

[kicken]

Try something like this:

$src = imagecreatefrompng($target);
$width=imagesx($src);
$height=imagesy($src);

$newwidth=54; // new width of image
$newheight=54;

$tmp=imagecreatetruecolor($newwidth,$newheight);
imagealphablending($tmp, false);
imagesavealpha($tmp, true);
imagefill($tmp, 0, 0, imagecolorallocatealpha($tmp, 0, 0, 0, 127));
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);

$image1 = imagecreatefrompng('Surround.png');
imagealphablending($image1, false);
imagesavealpha($image1, true);

imagecopymerge($image1, $tmp, 5, 5, 0, 0, 54, 54, 100);

 

[lilgezuz]

still coming out black, this stuff is confusing

[kicken]

If you post some sample images your working with we could help you better by having something to test with.

[joel24]

try this.

//edit forgot to add get image info & size.
$imgInfo = getimagesize($img);
$nWidth = 50;
$nHeight = 50;


$im = imagecreatefrompng($target);
$newImg=imagecreatetruecolor($newwidth,$newheight);
imagealphablending($newImg, false);
imagesavealpha($newImg,true);
$transparent = imagecolorallocatealpha($newImg, 0, 0, 0, 0);
$black = imagecolorallocate($newImg, 0, 0, 0);

imagefilledrectangle($newImg, 0, 0, $nWidth, $nHeight, $transparent);
// Make the background transparent
imagecolortransparent($newImg, $transparent);

imagecopyresampled($newImg, $im, 0, 0, 0, 0, $nWidth, $nHeight, $imgInfo[0], $imgInfo[1]);

[lilgezuz]

Here is some more of my code that I'm working with.

 

//$url = 'http://example.com/image.jpg';

$savedir = '/home/content/mypath/html/images/tmp_images'; //or anything else you want

$overwrite = true; //or false if image has to be renamed on duplicate

 

$urlinfo = parse_url($url);

$filename = basename($urlinfo['path']);

$target = $savedir.'/'.$filename;

if(file_exists($target) && !$overwrite){

//break up file in parts:

$pathinfo = pathinfo($target);

//max 50 tries

$max = 50;

//loop

for($i = 1;$i<=$max;$i++){

$target = $pathinfo['dirname']. '/' . $pathinfo['filename'] . '[' . $i

. '].' . $pathinfo['extention'];

//break on success, do not use file_exists to avoid race

$fh = @fopen($target,'x');

if($fh) break;

}

//alternatively, if you don't care about the name, you can just:

//$target = tempnam($savedir);

if(!$fh) die('Too many retries, no unique filename found.');

} else {

$fh = fopen($target,'w');

}

$check = fwrite($fh,file_get_contents($url));

fclose($fh);

// echo (($check) ? 'Successfully saved '.$target : 'Failure');

 

 

$src = imagecreatefrompng($target);

$width=imagesx($src);

$height=imagesy($src);

$newwidth=54; // new width of image

$newheight=54;

$tmp=imagecreatetruecolor($newwidth,$newheight);

imagealphablending($tmp, false);

imagesavealpha($tmp, true);

imagefill($tmp, 0, 0, imagecolorallocatealpha($tmp, 0, 0, 0, 127));

imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);

$image1 = imagecreatefrompng('Surround.png');

imagealphablending($image1, false);

imagesavealpha($image1, true);

imagecopymerge($image1, $tmp, 5, 5, 0, 0, 54, 54, 100);

 

if($type == 'PLATINUM'){ $image_name= 'images/games/'.$folder.'/0'.$id.'.png';}

if($type == 'GOLD'){ $image_name= 'images/games/'.$folder.'/0'.$id.'g.png';}

if($type == 'SILVER'){ $image_name= 'images/games/'.$folder.'/0'.$id.'s.png';}

if($type == 'BRONZE'){ $image_name= 'images/games/'.$folder.'/0'.$id.'b.png';}

imagepng($image1,constant('UPLOAD_DIR').$image_name, 9);

[code=php:0]

 

Attached images.  The trophy is the image I'm resizing to 54 x 54 then placing it in the center of the surrond.png file.  I think the problem is with the surrond.png or both images.  I dunno

[lilgezuz]

Anybody have any ideas?

[kicken]

This code appears to work for me (viewable at http://linode.aoeex.com/badge.html)

<?php

function resizeImage($im, $newW, $newH){
$imnew = ImageCreateTrueColor($newW, $newH);

$transparent = imagecolorallocatealpha($imnew, 0, 0, 0, 127);
imagefill($imnew, 0, 0, $transparent);

ImageAlphaBlending($imnew, false);
ImageSaveAlpha($imnew, true);

imagecopyresampled($imnew, $im, 0, 0, 0, 0, $newW, $newH, imagesx($im), imagesy($im));
ImageDestroy($im);
return $imnew;
}

$borderImage = ImageCreateFromPNG('surround.png');
ImageAlphaBlending($borderImage, false);
ImageSaveAlpha($borderImage, true);

$trophyImage = ImageCreateFromPNG('trophy.png');

//Resize the trophy down
$trophyImage = resizeImage($trophyImage, 54, 54);


//Copy the trophy to the border
ImageCopy($borderImage, $trophyImage, 5, 5, 0, 0, 54, 54);
header('Content-type: image/png');
ImagePNG($borderImage);
exit;