merhaba arkadaşlar netten php ile ilgili resim kırpma kodu buldum resimleri güzel kırpıyorum fakat kırpma alanı boş olan kısımlar olunca fon rengi siyah oluyor bunu beyaz kırmızı vss yapma imkanımız var mı ?

kod 
<?php
define("ccTOPLEFT",     0);
define("ccTOP",         1);
define("ccTOPRIGHT",    2);
define("ccLEFT",        3);
define("ccCENTRE",      4);
define("ccCENTER",      4);
define("ccRIGHT",       5);
define("ccBOTTOMLEFT",  6);
define("ccBOTTOM",      7);
define("ccBOTTOMRIGHT", 8);
$_imgOrig = imagecreatefromjpeg("../".$_POST['file']);
$percentx=$_POST['scalem'];
$percenty=$_POST['scalem'];
$nx = (($percentx / 100) * ImageSX($_imgOrig));
$ny = (($percenty / 100) * ImageSY($_imgOrig));

$ox = ImageSX($_imgOrig); 
$oy = ImageSY($_imgOrig); 
$nnx = $nx; 
$nny = $ny; 
 if($ox>$oy) 
        { 
            $nx = $ox*$ny/$oy; 
        } 
        elseif($ox<$oy) 
        { 
            $ny = $oy*$nx/$ox;     
        } 
$_imgFinal = ImageCreateTrueColor($nx, $ny); 
ImageCopyResampled($_imgFinal, $_imgOrig, 0, 0, 0, 0, $nx, $ny, $ox, $oy); 

    	 $_imgOrig = $_imgFinal;

$sx=$_POST['x1'];
$sy=$_POST['y1'];
$ex=$_POST['x2'];
$ey=$_POST['y2'];
$nx = abs($ex - $sx);
$ny = abs($ey - $sy);
$ox=$sx;
$oy=$sy;
	
    	if ($ox == -1 || $oy == -1)
		{
			list($ox, $oy) = _getCopyPosition($_imgFinal,$nx, $ny, $position);
		}
		
			$_imgFinal = ImageCreateTrueColor($nx, $ny);
			ImageCopyResampled($_imgFinal, $_imgOrig, 0, 0, $ox, $oy, $nx, $ny, $nx, $ny);
		

	function _getCopyPosition($_imgOrig,$nx, $ny, $position)
	{
		$ox = ImageSX($_imgOrig);
		$oy = ImageSY($_imgOrig);
		
		switch($position)
		{
			case ccTOPLEFT:
				return array(0, 0);
			case ccTOP:
				return array(ceil(($ox - $nx) / 2), 0);
			case ccTOPRIGHT:
				return array(($ox - $nx), 0);
			case ccLEFT:
				return array(0, ceil(($oy - $ny) / 2));
			case ccCENTRE:
				return array(ceil(($ox - $nx) / 2), ceil(($oy - $ny) / 2));
			case ccRIGHT:
				return array(($ox - $nx), ceil(($oy - $ny) / 2));
			case ccBOTTOMLEFT:
				return array(0, ($oy - $ny));
			case ccBOTTOM:
				return array(ceil(($ox - $nx) / 2), ($oy - $ny));
			case ccBOTTOMRIGHT:
				return array(($ox - $nx), ($oy - $ny));
		}
	}
	imagejpeg($_imgFinal, '../kirp.jpg', 100);
			

echo "<html><h1><a href=\"../\">try again</a></h1>";
echo "<img src=\"../img.jpg\"><br /><br />";		
echo "<img src=\"../test.jpg\">";	
?>
</html>