I need to resize an animated GIF file without destroying the animation.
How can I do it using PHP?
13 Answers
if you have imagemagick access, you can do this:
system("convert big.gif -coalesce coalesce.gif");
system("convert -size 200x100 coalesce.gif -resize 200x10 small.gif");
this is most likely possible with the imagemagick plugin if you don't have system() access
NOTE: this may create a larger filesize though a smaller dimensions image due to coalescing essentially deoptimizing the image.
UPDATE: If you don't have ImageMagick access, you should be able to use a combination of the following steps to resize an animated gif (assuming you have GD access):
- Detect if the image is an animated gif: Can I detect animated gifs using php and gd? (top answer)
- Split the animated gif into individual frames: http://www.phpclasses.org/package/3234-PHP-Split-GIF-animations-into-multiple-images.html
- Resize the individual frames: http://www.akemapa.com/2008/07/10/php-gd-resize-transparent-image-png-gif/
- Recomposite the frames into an animated gif again: http://www.phpclasses.org/package/3163-PHP-Generate-GIF-animations-from-a-set-of-GIF-images.html
This is definitely much more intensive than the ImageMagick route, but it should be technically possible.
If you get it working, please share with the world!
You would need to decompose the gif into frames, thumbnail and re-assemble.
Have a look at ImageMagick and this tutorial.
just creat 3 folder name 1.frame_output 2.images 3.resized_frame_output and download 2 encoder and decoder class from this below link 1.Download class "GIFDecoder.class.php" from http://phpclasses.elib.com/browse/package/3234.html 2.Download class "GIFEncoder.class.php" from http://phpclasses.betablue.net/browse/package/3163.html
and then run the script name as "resize_animator.php" , creat a upload html file & Let Enjoy the script.
..save this script as .....index.php.......
<html>
<body>
<table width="500" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<form action="resize_animator.php" method="post" enctype="multipart/form-data" >
<td>
<table width="100%" border="0" cellpadding="3" cellspacing="1" bgcolor="#FFFFFF">
<tr>
<td align="center"><font face="Tahoma">SELECT ANIMATED FILE</font>
<input type="file" name="uploadfile" size="20" accept="image/gif"/>
</td>
</tr>
<tr>
<td align="center"><input type="submit" name="Submit" value="PROCESS ANIMATION" /></td>
</tr>
</table>
</td>
</form>
</tr>
</table>
</body>
</html>
........................save and this script as resize_animator.php............
<?php
require "GIFDecoder.class.php";
include "GIFEncoder.class.php";
$file_name= $_FILES['uploadfile']['name'];
$file_ext = substr($file_name, -4);
$file_size=($_FILES["uploadfile"]["size"] /1024 );
if($file_ext=='.gif')
{
if($file_size > 0 && $file_size < 2000 )
{
session_start ( );
$uploaded_file = $_FILES['uploadfile']['tmp_name'];
$fp=file_get_contents($uploaded_file);
if ( $fp )
{
$_SESSION['delays'] = Array ( );
$gif = new GIFDecoder ( $fp );
$arr = $gif->GIFGetFrames ( );
$_SESSION [ 'delays' ] = $gif -> GIFGetDelays ( );
for ( $i = 0; $i < count ( $arr ); $i++ )
{
fwrite ( fopen ( ( $i < 10 ? "frame_output/$i$i_frame.gif" : "frame_output/$i_frame.gif" ), "wb" ), $arr [ $i ] );
}
}
function resize_frames($newwidth,$newheight)
{
$dir=opendir("frame_output/");
$i=0;
while($imgfile=readdir($dir))
{
if ($imgfile != "." && $imgfile!="..")
{
$imgarray[$i]=$imgfile;
$uploadedfile = "frame_output/".$imgarray[$i];
$src = imagecreatefromgif($uploadedfile);
list($width,$height)=getimagesize($uploadedfile);
$tmp=imagecreatetruecolor($newwidth,$newheight);
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
$filename = "resized_frame_output/".$imgarray[$i];
imagegif($tmp,$filename,100);
imagedestroy($src);
imagedestroy($tmp);
$i++;
}
}
closedir($dir);
if ( $dh = opendir ( "resized_frame_output/" ) )
{
while ( false !== ( $dat = readdir ( $dh ) ) )
{
if ( $dat != "." && $dat != ".." )
{
$frames [ ] = "resized_frame_output/$dat";
}
}
closedir ( $dh );
}
$gif = new GIFEncoder ( $frames,$_SESSION [ 'delays' ],0, 2, 0, 0, 0,"url" );
$data = $gif->GetAnimation ( );
$x='x';
$y='_';
$uploaded_file_name= $_FILES['uploadfile']['name'];
$actual_file_name = substr($uploaded_file_name, 0, -4);
$file_extention = substr($uploaded_file_name, -4);
$new_name=$actual_file_name.$y.$newwidth.$x.$newheight.$file_extention ;
//$output_image_name=$newwidth.$x.$newheight;
fwrite ( fopen ( "images/$new_name", "wb" ), $data );
//remove resized frames from folder
//sleep for 1 second
// usleep(2000000);
$dir = 'resized_frame_output/';
foreach(glob($dir.'*.*') as $v)
{
unlink($v);
}
} // end of function resize_frames
$gif = new GIFEncoder ( $frames,$_SESSION [ 'delays' ],0, 2, 0, 0, 0,"url" );
$data = $gif->GetAnimation ( );
$x='x';
$y='_';
$z='_p';
$uploaded_file_name= $_FILES['uploadfile']['name'];
$actual_file_name = substr($uploaded_file_name, 0, -4);
$file_extention = substr($uploaded_file_name, -4);
$new_name=$actual_file_name.$y.$newwidth.$x.$newheight.$z.$file_extention ;
//$output_image_name=$newwidth.$x.$newheight;
fwrite ( fopen ( "images/$new_name", "wb" ), $data );
//remove resized frames from folder
//sleep for 1 second
//usleep(2000000);
$dir = 'resized_frame_output/';
foreach(glob($dir.'*.*') as $v)
{
unlink($v);
}
} // end of function resize_frames
resize_frames(110,110);
resize_frames(120,160);
resize_frames(120,80);
resize_frames(128,96);
resize_frames(128,128);
resize_frames(208,208);
resize_frames(208,320);
session_destroy();
//usleep(200000);
//remove resized frames from folder
$dir = 'frame_output/';
foreach(glob($dir.'*.*') as $v)
{
unlink($v);
}
echo "<center><h1>Your Animation processing is compleated.</h1></center>";
echo "<center><h2><a href=\"index.php\">BACK TO UPLOAD PAGE</h2></center>";
} //end of file size checker
else
{
echo "<center><h2>You Upload a unfit size image .Upload a file within 2000 KB</h2></center>";
echo "<center><h2><a href=\"index.php\">BACK TO UPLOAD PAGE</h2></center>";
}
} //end of file extention checker
else
{
echo "<center><h2>Uplaod a gif file!</h2></center>";
echo "<center><h2><a href=\"index.php\">BACK TO UPLOAD PAGE</h2></center>";
}
?>
.......................LETS ENJOY............
uncomment the usleep function to see the work happen into those folders.its not necessary but i use it to see the functionality.
If you dont have Imagemagick in your server you may want to try this :
http://www.phpclasses.org/package/7353-PHP-Resize-animations-in-files-of-the-GIF-format.html
The class is resizing GIF animations with GD. First parses the frames, then resizes them, after that it compiles them again into single file without losing its delay times,disposal methods, color tables etc.
Try and if you find a bug or want to suggest some optimizations etc. you can use the class' forum or leave a comment on the page in my website. And I'll answer that ASAP.
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