Test 1:red-channel  Should produce 1571496937 33838
1571496937 33838
Test 2:green-channel  Should produce 394856971 33838
394856971 33838
Test 3:blue-channel  Should produce 3164158573 33838
3164158573 33838
Test 4:single-channel  Should produce 281226646 481
281226646 481
Test Invalid
Expected failure 1 (no output)
Expected failure 2 (no output)
Expected failure 3 (no output)