Okay, I fixed all the scope issues and stuff. It still doesn't work, though: 
{
    local $/ = \2;
    my $TileData = 0x0000;
    
    while(my $TileData = <$fhin>)
    {
        if(length($TileData) != 2)
        {
            warn "Warning: The input file had an uneven length.  Last 
+byte read: $TileData.";
            last;
        }
        my $NewTileData = (($TileData & 0xFC7F) | ($GFXFileBits));
        print {$fhout} $NewTileData;
    }
}

[download]
$TileData is still a string instead of a number, so it doesn't work with the bitwise operators.

In reply to Re^4: Question about binary file I/O by TheMartianGeek
in thread Question about binary file I/O by TheMartianGeek

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