Color Is off.

<?php
//The purpose of this script is to help me figure out if I am averaging and translating colors correctly for the ring spectrometer

$fiel = "red.jpg";
list($width, $height, $type, $attr) = getimagesize($fiel);
echo "<img src=\"". $fiel."\" $attr alt=\"getimagesize() example\" />";

$centerX = $width / 2;
$centerY = $height / 2;
echo "<br>The center of the image is at " .$centerX . ", " . $centerY ;
echo '<br>Test Trig Fucntions php <br> Get all cordinates for a circle<br>';
$r = 1 ;
$sum = 0;
echo 'Radiuz == ' . $r . '<br> X, Y, PixelColour at that point.<br><br>';

$im = imagecreatefromjpeg($fiel);
$Pi = pi();
for ($a=0; $a<=1; $a++) {

   $ax =  $r*cos($a*$Pi/180) + $centerX ; //x
   $ay =  $r*sin($a*$Pi/180) + $centerY ; //y
   $PXCol = imagecolorat($im, $ax, $ay);
   echo $ax . ", " . $ay . ", " . $PXCol . "<br>";
//$sum = $sum + $PXCol;
//$avg = $sum / 360;


}
//Says red ff0000 is 16646144


//echo "<br>Average Pixel Value in ring is: ". $avg . "<br>";
//$trunc = round($avg);
//echo "<br>Trucated Average:  ".$trunc."<br>";
echo "<br>Average in Hex:  ". dechex(16646144) ."<br>";
echo "<br>The value FF0000 should be:  ". hexdec("#FF0000") ."<br>";

?>