Bøvl med farver i gdlib

Jeg genererer grafer ud fra et db-udtræk. Til formålet bruger jeg GDlib. I følgende kode dannes søjlediagrammerne fint nok, men problemet er, at 1. søjle i hver graf bliver rød (ok) men resten af søjlerne bliver sorte.

Koden: (undskyld længden)

<?php
  header("Content-type: image/jpeg");
  $imSizeX = 270;
  $imSizeY = 250;

  $myImage = ImageCreateFromJpeg("grafik/graf_bg_270x250.jpg");
  // $myImage = imageCreate($imSizeX, $imSizeY);
 
  $white = ImageColorAllocate($myImage, 255, 255, 255);
  $black = ImageColorAllocate($myImage, 0, 0, 0);
  $red = ImageColorAllocate($myImage, 255, 0, 0);
  $green = ImageColorAllocate($myImage, 0, 255, 0);
  $blue = ImageColorAllocate($myImage, 0, 0, 255);
    $graa = ImageColorAllocate($myImage, 245, 245, 245);
   
  ImageFill($myImage, 0, 0, $graa);
    Imagerectangle($myImage, 0, 0, $imSizeX-1, $imSizeY-1, $black);
    Imageinterlace($myImage, 0);


include ("config.php");

$xen = 15;

$hent = "select * from produktion where maaned = '$maaned' order by aar asc limit 12";
$hent_gns = "select AVG (produktion) AS gns from produktion where maaned = '$maaned' AND produktion > 0";
$koer_hent = mysql_query($hent);
$koer_hent_gns = mysql_query($hent_gns);
While ($row=mysql_fetch_array($koer_hent)) {
switch ($maaned) {
case "01":
  $strMaaned = "Januar";
  break;
case "02":
  $strMaaned = "Februar";
  break;
case "03":
  $strMaaned = "Marts";
  break;
case "04":
  $strMaaned = "April";
  break;
case "05":
  $strMaaned = "Maj";
  break;
case "06":
  $strMaaned = "Juni";
  break;
case "07":
  $strMaaned = "Juli";
  break;
case "08":
  $strMaaned = "August";
  break;
case "09":
  $strMaaned = "September";
  break;
case "10":
  $strMaaned = "Oktober";
  break;
case "11":
  $strMaaned = "November";
  break;
case "12":
  $strMaaned = "December";
  break;
}
$prod = $row[produktion]/500;

Imagestring($myImage, 3, 12, 12, ($strMaaned), $black);
Imagefilledrectangle($myImage, $xen, 200-$prod, $xen+7, 200, $red);
Imagerectangle($myImage, $xen, 200-$prod, $xen+7, 200, $black);

$dateImage = ImageCreate(30, 20);
$white = ImageColorAllocate($dateImage, 255, 255, 255);
$black = ImageColorAllocate($dateImage, 0, 0, 0);
$red = ImageColorAllocate($dateImage, 255, 0, 0);
$green = ImageColorAllocate($dateImage, 0, 255, 0);
$blue = ImageColorAllocate($dateImage, 0, 0, 255);
$graa = ImageColorAllocate($dateImage, 245, 245, 245);


ImageFill($dateImage, 0, 0, $graa);
Imageinterlace($dateImage, 0);
Imagestring($dateImage, 3, 0, 0, ($row[aar]), $black);
$rotated = Imagerotate($dateImage, 90, 0);
imagecopymerge($myImage, $rotated, $xen-3, 210, 0, 0, imagesx($rotated), imagesy($rotated),100);
$xen=$xen+20;
Imagedestroy($dateImage);

}
    While ($row_gns=mysql_fetch_array($koer_hent_gns)) {
  imageline ( $myImage, 10, 200-$row_gns[gns]/500, 245, 200-$row_gns[gns]/500, $blue);
    }
  Imagejpeg($myImage,'',100);

  Imagedestroy($myImage);
 
?>