Grazie 1000... questo è quello che mi viene stampato a video:
Warning: imagejpeg() [function.imagejpeg]: Unable to open 'repository/public%2Fvillages%2F10%2F2006%2F2.jpg§191_144' for writing: Permission denied in /home/www/5bdf89763527da301a723c15f36dcee6/web/v2/resizer.php on line 78

Warning: imagecreatefromjpeg(repository/public%2Fvillages%2F10%2F2006%2F2.jpg§191_144) [function.imagecreatefromjpeg]: failed to open stream: No such file or directory in /home/www/5bdf89763527da301a723c15f36dcee6/web/v2/resizer.php on line 22

Warning: imagejpeg(): supplied argument is not a valid Image resource in /home/www/5bdf89763527da301a723c15f36dcee6/web/v2/resizer.php on line 23

Warning: imagedestroy(): supplied argument is not a valid Image resource in /home/www/5bdf89763527da301a723c15f36dcee6/web/v2/resizer.php on line 24

e questo qui sotto è il file che fa il resize:
Codice PHP:
<?php
require("globals.inc");
header ("Content-type: image/jpeg");

if(!file_exists($img_path))
{
    $im = imagecreatetruecolor($w, $h);
    $bg = imagecolorallocate($im, 255, 255, 255); 
    $text_color = imagecolorallocate($im, 0, 0, 0);
    imagestring($im, 2, 20, 10,  "Non disponibile", $bg);
    imagejpeg($im, "", 100);
    imagedestroy($im);    
}
else
{
    $cachedpath = getCachedPath($img_path, $w, $h);
    if(!file_exists($cachedpath))
    {
        ResizeImage($img_path, $w, $h, true);
    }
    
    $source = ImageCreateFromJPEG($cachedpath);
    imagejpeg($source, "", 80);
    imagedestroy($source);
}
    //ResizeImage("public/temp.jpg", 20, 20, true);


function ResizeImage($filename, $th_width, $th_height, $forcefill)
{    
    global $_repository;
    list($width, $height) = getimagesize($filename);

   if(substr($filename, strlen($filename) - 3, 3) == "jpg")
        $source = ImageCreateFromJPEG($filename);
   
   if(substr($filename, strlen($filename) - 3, 3) == "gif")
        $source = ImageCreateFromGIF($filename);
   
   if(substr($filename, strlen($filename) - 3, 3) == "png")
        $source = ImageCreateFromPNG($filename);
    
   if($width > $th_width || $height > $th_height)
   {
     $a = $th_width/$th_height;
     $b = $width/$height;

     if(($a > $b)^$forcefill)
     {
         $src_rect_width  = $a * $height;
         $src_rect_height = $height;
         if(!$forcefill)
         {
           $src_rect_width = $width;
           $th_width = $th_height/$height*$width;
         }
     }
     else
     {
         $src_rect_height = $width/$a;
         $src_rect_width  = $width;
         if(!$forcefill)
         {
           $src_rect_height = $height;
           $th_height = $th_width/$width*$height;
         }
     }

     $src_rect_xoffset = ($width - $src_rect_width)/2*intval($forcefill);
     $src_rect_yoffset = ($height - $src_rect_height)/2*intval($forcefill);

     $thumb  = imagecreatetruecolor($th_width, $th_height);
     
     
     
       imagecopyresampled($thumb, $source, 0, 0, $src_rect_xoffset, $src_rect_yoffset, $th_width, $th_height, $src_rect_width, $src_rect_height);
       $cachedpath = getCachedPath($filename, $th_width, $th_height);
       imagejpeg($thumb, $cachedpath, 80);
       imagedestroy($thumb);
   }
   else
   {
       imagejpeg( $source,"", 80);
       imagedestroy($source);
   }
}

function getCachedPath($filename, $w, $h)
{
    global $_repository; 
    $encodedname = urlencode($filename) . "§" . $w . "_" . $h;
    $cachedpath = $_repository . "/" . $encodedname;

    return $cachedpath;
}
  
?>
Non so se la soluzione al problema puo essere nascosta nei warning... io ho pensato subito ad una questione di permessi e basta... sono molto confuso dal fatto che alcune foto funzionano e altre no... bhoo