[php] fehler bei imagecreate?

[AtK - php-lists]

Warum bekomme ich hier nur ein schwarzes thumbnail aus?


  $size = GetImageSize($foto_full_name);
  $dst_img=ImageCreate($new_width,$new_height);
  $src_img=ImageCreateFromJpeg($foto_full_name);

ImageCopyResized($dst_img,$src_img,0,0,0,0,$new_w,$new_h,ImageSX($src_img),I
mageSY($src_img));
  $thumb_full_name = $foto_name.$thumb_name.".".$foto_typ_name;
  Imagejpeg($dst_img,$dir.$thumb_full_name);

thx for help :)