The unaltered black and white footage is "real" in the sense that the information it records, the shades of grey, are actually causally connected to the event i

The unaltered black and white footage is "real" in the sense that the information it records, the shades of grey, are actually causally connected to the event it depicts. If I colourise it, the cause or the information is coming from me, the shade of red you see is just my arbitrary choice, it is determined by me and not by the actual light bouncing off the blood of a soldier in 1914. As such the information added by colourisation is less "real" in this sense or entirely "false".