You need to divide by whichever ratio is the greatest:
rescale( 1000, 1234 );
rescale( 100, 1000 );
sub rescale
{
my ( $height, $width ) = @_;
my $maxh = "600";
my $maxw = "800";
if ($height > $maxh || $width > $maxw)
{
my $hratio = $height / $maxh;
my $wratio = $width / $maxw;
my $ratio = $hratio > $wratio ? $hratio : $wratio;
my $newh = $height / $ratio;
my $neww = $width / $ratio;
printf "H=%d W=%d ratios: old=%0.2f new =%0.2f\n",
$newh, $neww, $height / $width, $newh / $neww;
}
}
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