[mann@N1NLF-2 cement]$ ./trowel.pl      # SA1100 benchmark
Value of <HANDLE> construct can be "0"; test with defined() at ./trowel.pl line 65535.
Init sv035.jpg.ppm, R1.5 G1.5 B0.0 1.420000(s)
Add  sv080.jpg.ppm, R0.0 G0.0 B9.0 1.850000(s)
Add  sv097.jpg.ppm, R0.0 G3.0 B0.0 1.840000(s)
Add  sv100.jpg.ppm, R1.0 G0.0 B0.0 1.910000(s)
Add  sv101.jpg.ppm, R2.0 G0.0 B2.0 2.080000(s)
Create trowel_out.ppm, 3.560000(s)

[mann@N1NLF-2 cement]$ ./trowel.pl 
Value of <HANDLE> construct can be "0"; test with defined() at ./trowel.pl line 65535.
Init sv035.jpg.ppm.gz, R1.5 G1.5 B0.0 1.420000(s)
Add  sv080.jpg.ppm.gz, R0.0 G0.0 B9.0 1.940000(s)
Add  sv097.jpg.ppm.gz, R0.0 G3.0 B0.0 1.880000(s)
Add  sv100.jpg.ppm.gz, R1.0 G0.0 B0.0 1.890000(s)
Add  sv101.jpg.ppm.gz, R2.0 G0.0 B2.0 2.060000(s)
Create trowel_out.ppm, 3.650000(s)