Ciernu farbu zmeni, ostatne nie

$data = getimagesize($image);
$width = intval($data[0]);
$height = intval($data[1]);
$hex = "FF00FF";
$oldhex = "FF00FF";
$im = imagecreatefromPNG($image);
$color =
imagecolorallocatealpha($im,hexdec(substr($hex,0,2)),hexdec(substr($hex,2,2)),hexdec(substr($hex,4,6)),127);
$color2 = imagecolorallocate($im,hexdec("00"),hexdec("00"),hexdec("00"));
for($cloneH=0;$cloneH<$height;$cloneH++)
{
   for($x=0;$x<$width;$x++)
   {
      if(!colormatch($im,$x,$cloneH, "FFFF00"))
         imagesetpixel($im, $x, $cloneH, $color);
   }
}
$dest = imagecreatetruecolor(355, 252);

//imagecopy($dest, $im, 0, -71, 1, 13, 535, 336);

header("Content-Type: {$data['mime']}");
imagePNG($im);
function colormatch($image,$x,$y,$hex)
{
   $rgb = imagecolorat($image,$x,$y);
   $r = ($rgb >> 16) & 0xFF;
   $g = ($rgb >> 8) & 0xFF;
   $b = $rgb & 0xFF;
   
   $r2 = hexdec(substr($hex,0,2));
   $g2 = hexdec(substr($hex,2,2));
   $b2 = hexdec(substr($hex,4,6));
   if( $r == $r2 && $b == $b2 && $g == $g2 )
   return true;
   return false;
}