def pixel(argb):
        return argb
See https://github.com/richardkiss/pycoin/issues/39 and
dataset/ETHPy150Open SimonSapin/cairocffi/cairocffi/compat.py/pixel--crossover with--dataset/ETHPy150Open richardkiss/pycoin/tests/tx_test.py/TxTest.test_issue_39