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Scaling image is losing background transparency [message #171660]

Fri, 14 January 2011 18:56

laredotornado@zipmail
Messages: 5
Registered: January 2011

Karma:

Junior Member

Hi,

I'm using PHP 5 and trying to scale png images programatically. Here
is what I'm doing ...

$src_img = imagecreatefrompng($imagefile);
$hw = getimagesize($imagefile);
$new_w = $w;
$new_h = $hw["1"]/($hw["0"]/$w);
$dst_img = @imagecreatetruecolor($new_w, $new_h);
if(!$dst_img) {
$dst_img = imageCreate($new_w, $new_h);
}
imagecopyresized($dst_img,$src_img,0,0,0,0,$new_w,
$new_h,imagesx($src_img),imagesy($src_img));
imagepng($dst_img);

The problem is my scaled png image loses its background transparency.
The short of this is, does anyone know how to scale PNG images
effectively and what other information can I provide to help
troubleshoot this further?

Thanks, - Dave

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[Message index]

		Scaling image is losing background transparency By: laredotornado@zipmail on Fri, 14 January 2011 18:56
		Re: Scaling image is losing background transparency By: Thomas 'PointedEars' on Fri, 14 January 2011 23:12
		Re: Scaling image is losing background transparency By: The Natural Philosoph on Sat, 15 January 2011 12:57
		Re: Scaling image is losing background transparency By: Michael Fesser on Sat, 15 January 2011 23:12
		Re: Scaling image is losing background transparency By: The Natural Philosoph on Sun, 16 January 2011 01:15
		Re: Scaling image is losing background transparency By: Chuck Anderson on Sun, 16 January 2011 02:48
		Re: Scaling image is losing background transparency By: The Natural Philosoph on Sun, 16 January 2011 03:39
		Re: Scaling image is losing background transparency By: Chuck Anderson on Sun, 16 January 2011 08:29
		Re: Scaling image is losing background transparency By: The Natural Philosoph on Sun, 16 January 2011 12:11
		Re: Scaling image is losing background transparency By: Michael Fesser on Mon, 17 January 2011 13:17
		Re: Scaling image is losing background transparency By: Henrik Carlqvist on Mon, 17 January 2011 21:56
		Re: Scaling image is losing background transparency By: Thomas 'PointedEars' on Mon, 17 January 2011 23:38
		Re: Scaling image is losing background transparency By: sheldonlg on Tue, 18 January 2011 16:08
		Re: Scaling image is losing background transparency By: Chuck Anderson on Sat, 15 January 2011 03:07

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