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Unpack() does the reverse of pack(): it takes a string representing a 
+structure and
expands it out into a list value, returning the array value. (In scala
+r context, it
returns merely the first value produced.) The TEMPLATE has the same fo
+rmat as in the 
pack() function. (...)

open(IMG,"foo.gif");
foreach (<IMG>) {
...
    print "\n";
}
close(IMG);