function pImage($XSize,$YSize,$DataSet = NULL)  {
     if ( $DataSet != NULL ) { $this->DataSet = $DataSet; }

     $this->XSize   = $XSize;
     $this->YSize   = $YSize;
     $this->Picture = imagecreatetruecolor($XSize,$YSize);

     imagealphablending($this->Picture, false);
     
     $col=imagecolorallocatealpha($this->Picture, 255, 255, 255, 127);
     imagefilledrectangle($this->Picture, 0,0,$XSize, $YSize, $col);
     
     imagealphablending($this->Picture,TRUE);

     // $C_White = $this->AllocateColor($this->Picture,255,255,255);
     // imagefilledrectangle($this->Picture,0,0,$XSize,$YSize,$C_White);
     
    }

...

/* Render the picture to a file */
   function render($FileName) {
       imagealphablending($this->Picture,false);
      imagesavealpha($this->Picture,true);
       imagepng($this->Picture,$FileName);
    }