def getColumns(self):
        args = map(lambda x: self.mMali[x].mString, self.mIdentifiers)
        return map(lambda x: "".join(x), zip(*args))
Converts a layer from the ``decoded_data`` to a PIL image.
dataset/ETHPy150Open CGATOxford/cgat/CGAT/Mali.py/Mali.getColumns--crossover with--dataset/ETHPy150Open psd-tools/psd-tools/src/psd_tools/user_api/pil_support.py/extract_layer_image