[php-gd]

[marketto]

guarda se può funzionare:

header("Content-type: image/jpeg");
$im = imagecreatetruecolor(10, 100);
$background = imagecolorallocate($im, 255, 255, 255);
imagefilledrectangle($im, 0, 0, 10, 100, $background);
$percentuale=60;
$temp=127/$percentuale;
for ($i=1;$i<$percentuale;$i++){
	$colore = imagecolorallocatealpha($im, 255, 0, 0, $temp*$i);
	imagefilledrectangle($im, 0, $i, 10, $i+1, $colore);
	imagecolordeallocate($im, $colore);
}
imagejpeg($im);
imagedestroy($im);