How to resize a GIF


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*kimaci    (2010-05-22)
How to resize a GIF

Hi all, here is a small script very useful that is able to resize a GIF while maintaining the transparency:

rename($_FILES['image']['tmp_name'], $image_path);

// chmod($image_path,0755);

list($photo_width,$photo_height) = getimagesize($image_path);
 
if ($img_size[2] == 1) $photo_resource = imagecreatefromgif($image_path);
elseif ($img_size[2] == 3) $photo_resource = imagecreatefrompng($image_path);
else $photo_resource = imagecreatefromjpeg($image_path);

$photo_resource_resized = imagecreatetruecolor($new_width, $new_height);

if ($img_size[2] == 1)
{
  $originaltransparentcolor = imagecolortransparent( $photo_resource );
  if ($originaltransparentcolor >= 0 && $originaltransparentcolor < imagecolorstotal($photo_resource))
{
  $transparentcolor = imagecolorsforindex( $photo_resource, $originaltransparentcolor );
  $newtransparentcolor = imagecolorallocate($photo_resource_resized, $transparentcolor['red'], $transparentcolor['green'],$transparentcolor['blue']);
  imagefill( $photo_resource_resized, 0, 0, $newtransparentcolor );
  imagecolortransparent( $photo_resource_resized, $newtransparentcolor );
}
}

imagecopyresampled($photo_resource_resized, $photo_resource, 0, 0, 0, 0, $new_width, $new_height, $photo_width, $photo_height);
 
if ($img_size[2] == 1) imagegif($photo_resource_resized,$image_path);
elseif ($img_size[2] == 3) imagepng($photo_resource_resized,$image_path);
else imagejpeg($photo_resource_resized,$image_path);



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