palette limited to 256 colors with ImageColorAllocate()?

I thought this script would create a 256*256 pixel image, each one of a random color: ______________________________ <?php dl("php_gd.dll"); $im1 = imagecreate (257,257); for ($i=0; $i<=256; $i++) { for ($j=0; $j<=256; $j++) { $color = ImageColorAllocate ($im1, rand(0,255), rand(0,255), rand(0,255) ) ; imageline ($im1, $i,$j, $i+1, $j+1 , $color); } } $filename= "c:\\temp\\prova.jpg"; ImageJPEG ( $im1, $filename , 97); imagedestroy ($im1); echo "<img src='$filename'>"; ?> ______________________________ but it seems you can't allocate more than 256 colors (though you get no errors).. could anybody try it on a linux box? is this a bug or it's the normal behaviour? thanks for any help, bye, Giuse http://boltthrower.webhop.org