for my $y (0..(@in-1)) {
for my $x (0..(@{$in[$y]}-1)) {
I'm puzzled as to why you do the subtractions to find the upper bound of the arrays rather than use the $#array that Perl provides.
for my $y ( 0 .. $#in ) {
for my $x ( 0 .. $#{$in[$y]} ) {
Cheers, JohnGG
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