Question

I need to flip an image so that a character faces in the right direction. This needs to be done ‘on the fly’ as they say.

The issue I am having is that with Gif images, I seem to lose the transparency. (The background goes white)

Below is the code: (Alternatively someone could send me to a good example)

$img = imagecreatefromgif('./unit.gif');  $size_x = imagesx($img); $size_y = imagesy($img);  $temp = imagecreatetruecolor($size_x, $size_y);  imagecolortransparent($img, imagecolorallocate($img, 0, 0, 0)); imagealphablending($img, false); imagesavealpha($img, true);  $x = imagecopyresampled($temp, $img, 0, 0, ($size_x-1), 0, $size_x, $size_y, 0-$size_x, $size_y);  if ($x) {     $img = $temp; } else {     die('Unable to flip image'); }  header('Content-type: image/gif'); imagegif($img); imagedestroy($img); 

Answer 1

Shouldn’t this:

imagecolortransparent($img, imagecolorallocate($img, 0, 0, 0)); imagealphablending($img, false); imagesavealpha($img, true); 

…be this:

imagecolortransparent($temp, imagecolorallocate($img, 0, 0, 0)); imagealphablending($temp, false); imagesavealpha($temp, true); 

Note you should be calling these functions for the $temp image you have created, not the source image.