note 11530 added to ImageColorAllocate

This seems to be true, although to prevent this kind of unexpected result, you'd normally use an ImageFill before drawing anything else to explicitly set the bg color. /* begin quote */ yaxinwen@eyou.com wrote at 09-Oct-2000 11:21: It seems that the first color allocated in an image will be the background color. Example: <?php Header("Content-type:&nbsp;image/gif"); $image = ImageCreate(200, 200); $red = ImageColorAllocate($image, 255, 0,0); $blue = ImageColorAllocate($image, 0, 0, 255); ImageRectangle($image, 50, 50, 150, 150, $blue); ImageGIF($image); ImageDestory($image); ?> You'll see a blue rectangle on a red background. /* end quote */ http://www.php.net/manual/en/function.imagecolorallocate.php