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+--- Thread: image_lib - resizing transparent png24 (/showthread.php?tid=7857)
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image_lib - resizing transparent png24 - El Forum - 04-25-2008
[eluser]mandelkern[/eluser]
Hi,
I tried to resize a png-24 file with the codeigniter-image_lib, using GD2. The result looses its transparency and shows a black background.
I couldn't find any solutions, fixing this within the image_lib.
Can someone help me with this problem?
Thanks.
image_lib - resizing transparent png24 - El Forum - 04-25-2008
[eluser]Référencement Google[/eluser]
Look at:
http://ellislab.com/forums/viewthread/62955/#311374
Is this helping?
image_lib - resizing transparent png24 - El Forum - 04-25-2008
[eluser]mandelkern[/eluser]
Thanks, elite but I already tried this. It helps fine with gif and png-8 but my problem seems to be special with GD2 and png-24.
image_lib - resizing transparent png24 - El Forum - 04-25-2008
[eluser]Référencement Google[/eluser]
I posted the issue some time ago:
http://ellislab.com/forums/viewthread/71962/
It is a CI bug and it looks like nobody has found a solution yet. You'll have to dive into the CI Image lib code and rework the GD part that make the transparency working. Sorry I can't help much more.
image_lib - resizing transparent png24 - El Forum - 04-25-2008
[eluser]mandelkern[/eluser]
Ok. Thanks anyway. I'll try my best :-)
image_lib - resizing transparent png24 - El Forum - 04-25-2008
[eluser]Référencement Google[/eluser]
If you find a solution please post it.
image_lib - resizing transparent png24 - El Forum - 04-25-2008
[eluser]BorisK[/eluser]
I had this same problem solved in PHP a while ago. Can you send me a link to a sample image that fails to work. If it keeps transparency in my code I'll port the hack to CI library.
image_lib - resizing transparent png24 - El Forum - 04-25-2008
[eluser]mandelkern[/eluser]
I found a solution at http://www.webdeveloper.com/forum/showthread.php?t=178210.
Nearly at line
514 - $dst_img = $create($this->width, $this->height);
I changed the code this way:
//$dst_img = $create($this->width, $this->height);
/* TRANSPARENT PNG */
$dst_img = imagecreatetruecolor($this->width, $this->height);
$transparent = imagecolorallocatealpha($dst_img,0,255,0,127);
imagefill($dst_img,0,0,$transparent);
$copy($dst_img, $src_img, 0, 0, $this->x_axis, $this->y_axis, $this->width, $this->height, $this->orig_width, $this->orig_height);
imageAlphaBlending($dst_img, false);
imageSaveAlpha($dst_img, true);
..and now it works.
image_lib - resizing transparent png24 - El Forum - 04-25-2008
[eluser]Référencement Google[/eluser]
Hey that's really cool, please report that + solution to the bug tracker of CI or to the forums bugs category
image_lib - resizing transparent png24 - El Forum - 04-25-2008
[eluser]BorisK[/eluser]
That's pretty similar to my PHP code, except that I refactored the ImageSetAlpha function:
Code:
function ResizeImage($newWidth, $newHeight)
{
$this->newWidth = $newWidth;
$this->newHeight = $newHeight;
$this->dest_image = imagecreatetruecolor($this->newWidth, $this->newHeight);
$this->ImageSetAlpha();
imagecopyresampled($this->dest_image, $this->src_image, 0, 0, 0, 0,
$this->newWidth, $this->newHeight, imagesx($this->src_image), imagesy($this->src_image));
$this->src_image = $this->dest_image;
}
function ImageSetAlpha ()
{
$background = imagecolorallocate($this->dest_image, 0, 0, 0);
ImageColorTransparent($this->dest_image, $background);
imagealphablending($this->dest_image, false);
}