SimpleImage

class SimpleImage {

   private $image;
   private $image_type;

   public function load($filename)
   {
      $image_info = getimagesize($filename);
      $this->image_type = $image_info[2];

      if ($this->image_type == IMAGETYPE_JPEG) {
         $this->image = imagecreatefromjpeg($filename);
      }
      elseif ($this->image_type == IMAGETYPE_GIF) {
         $this->image = imagecreatefromgif($filename);
      }
      elseif ($this->image_type == IMAGETYPE_PNG) {
         $this->image = imagecreatefrompng($filename);
      }
   }

   public function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null)
   {
      if ($image_type == IMAGETYPE_JPEG) {
         imagejpeg($this->image,$filename,$compression);
      }
      elseif ($image_type == IMAGETYPE_GIF) {
         imagegif($this->image,$filename);
      }
      elseif ($image_type == IMAGETYPE_PNG) {
         imagepng($this->image,$filename);
      }

      if( $permissions != null) {
         chmod($filename,$permissions);
      }
   }

   public function output($image_type=IMAGETYPE_JPEG)
   {
      if ($image_type == IMAGETYPE_JPEG) {
         imagejpeg($this->image);
      }
      elseif ($image_type == IMAGETYPE_GIF) {
         imagegif($this->image);
      }
      elseif ($image_type == IMAGETYPE_PNG) {
         imagepng($this->image);
      }
   }

   public function getWidth()
   {
      return imagesx($this->image);
   }

   public function getHeight()
   {
      return imagesy($this->image);
   }

   public function resizeToHeight($height)
   {
      $ratio = $height / $this->getHeight();
      $width = $this->getWidth() * $ratio;
      $this->resize($width,$height);
   }

   public function resizeToWidth($width)
   {
      $ratio = $width / $this->getWidth();
      $height = $this->getheight() * $ratio;
      $this->resize($width,$height);
   }

   public function scale($scale)
   {
      $width = $this->getWidth() * $scale/100;
      $height = $this->getheight() * $scale/100;
      $this->resize($width,$height);
   }

   public function resize($width,$height)
   {
      $new_image = imagecreatetruecolor($width, $height);
      imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
      $this->image = $new_image;
   }
}