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Trouble cropping an animated gif

 
This forum is locked: you cannot post, reply to, or edit topics.   This topic is locked: you cannot edit posts or make replies.    php.amnuts.com Forum Index -> Crop Canvas
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Mithrilhall
Newbie


Joined: 30 Dec 2005
Posts: 1
PostPosted: Fri Dec 30, 2005 3:53 pm    Post subject: Trouble cropping an animated gif Reply with quote
Does anyone know how to crop an animated gif?

This is the code I'm using:

Code:

$imgfile = "E:\Program Files\Images\weather2.gif";
   require 'class.cropcanvas.php';
   $cc = new canvasCrop();
   
   $cc->loadImage($imgfile);
   $cc->cropByPercent(15, 50, ccCENTER);
   $cc->saveImage('resized.gif', 90);
   
   $cc->flushImages();
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amnuts
Site Admin


Joined: 01 Sep 2002
Posts: 662
Location: East Sussex, England
PostPosted: Thu Jan 05, 2006 4:02 am    Post subject: Reply with quote
When the class was written the gif capability was generally taken out of PHP because of the patent issues, and as a result of that the class was not written with gif images in mind - only jpg and png. Now that the patent has expired, gif is making its was back in to the GD library with PHP.

If you want to include gif support then you'd need to make a few changes to the class - or create an extension class, of course!

In the saveImage method, find this line:

Code:
if ($ext == 'png') $saved = $func($this->_imgFinal, $filename);;


and change it to be:

Code:
if ($ext == 'png' || $ext == 'gif') $saved = $func($this->_imgFinal, $filename);


In the showImage method find this block:

Code:
else if ($type == 'jpg' || $type == 'jpeg')
{
    echo @ImageJPEG($this->_imgFinal, '', $quality);
    return true;
}


and add this after it:

Code:
else if ($type == 'gif')
{
    echo @imagegif($this->_imgFinal);
    return true;
}


I've no idea how it'll handle animated gifs, sorry.

Andy
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V@no
Light Poster


Joined: 10 Apr 2003
Posts: 30
PostPosted: Tue Mar 14, 2006 11:06 pm    Post subject: Reply with quote
Keep in mind, the lattest GD version can only handle first frame of animated gif images...
so, basicaly you will endup with non-animated image if you let GD manipulate it...Sad
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