In addition to the above:
Instead of long runs of single-line comments, use POD.
my $mode = shift;
my $frames = shift;
my $lossy = shift;
my $skip = shift;
my @bitmap = <>;
Even better might be the use of a commandline option processor, e.g. Getopt::Long
foreach $item (@bitmap)
@image = split //, join '', @bitmap;
It's not clear why
Such a construct usually implies protecting variables from being clobbered... but I don't see any clobbering going on...
# If you don't want to use this optimization, just
# comment out the whole if statement.
Why not provide a command line switch for it?
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