GD png black background, turning it to white?

[sammysmee]

Hi there, i currently have a perfect gd code running on my stock art site, i have it so it renders the png with a watermark across it, however due to it being a png it puts a black background behind the thumbnail and the resized image, i would like to make this white, but i do not know GD (i was given the gd code) could any one help? I tried solving it but with no luck.

 

the code is below..

 

//$filename should be a JPG and $watermark a PNG-24 with alpha transparency. $quality is 1-100 JPG quality on output.

function watermark($srcfilename, $newname, $watermark, $quality) {

$imageInfo = getimagesize($srcfilename); 

$width = $imageInfo[0]; 

$height = $imageInfo[1]; 

$logoinfo = getimagesize($watermark);

$logowidth = $logoinfo[0];

$logoheight = $logoinfo[1];

$horizextra =$width - $logowidth;

$vertextra =$height - $logoheight;

$horizmargin =  round($horizextra / 2);

$vertmargin =  round($vertextra / 2);

$photoImage = ImageCreateFromPNG($srcfilename);

ImageAlphaBlending($photoImage, true);

$logoImage = ImageCreateFromPNG($watermark);

$logoW = ImageSX($logoImage);

$logoH = ImageSY($logoImage);

ImageCopy($photoImage, $logoImage, $horizmargin, $vertmargin, 0, 0, $logoW, $logoH);

//ImageJPEG($photoImage); // output to browser

ImageJPEG($photoImage,$newname, $quality); 

ImageDestroy($photoImage);

ImageDestroy($logoImage);

}



function createthumb($name,$filename,$new_w,$new_h)

{

$system=explode(".",$name);

if (preg_match("/jpg|jpeg/",$system[1])){$src_img=imagecreatefromjpeg($name);}

if (preg_match("/png/",$system[1])){$src_img=imagecreatefrompng($name);}

    if (preg_match("/gif/",$system[1])){$src_img=imagecreatefromgif($name);}

    if (preg_match("/bmp/",$system[1])){$src_img=imagecreatefromwbmp($name);}

    	$old_x=imageSX($src_img);

$old_y=imageSY($src_img);

if ($old_x > $old_y) 

{

	$thumb_w=$new_w;

	//$thumb_h=$old_y*($new_h/$old_x);

        $thumb_h=$new_h;

}

if ($old_x < $old_y) 

{

	//$thumb_w=$old_x*($new_w/$old_y);

        $thumb_w=$new_w;

	$thumb_h=$new_h;

}

if ($old_x == $old_y) 

{

	$thumb_w=$new_w;

	$thumb_h=$new_h;

}

$dst_img=ImageCreateTrueColor($thumb_w,$thumb_h);

imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y); 

if (preg_match("/png/",$system[1]))

{

	imagepng($dst_img,$filename); 

} else if (preg_match("/jpg|jpeg/",$system[1])) {

	imagejpeg($dst_img,$filename); 

}

    else if (preg_match("/bmp/",$system[1]))

    {

        imagewbmp($dst_img,$filename);

    }

    else

    {

        imagegif($dst_img,$filename);     

    }

imagedestroy($dst_img); 

imagedestroy($src_img); 

}   

[sammysmee]

sorry to bump, but its been months and i still need the help!

 

thanks

- sammy