Silly question, but was the bridge definitely painted red at that stage of its life?
Panchromatic vs orthochromatic was still a choice even in the 70s. Spotmatics shipped with an ISO marker dial that included color, ortho, and panchro, 30 years after the Golden Gate Bridge was built.
Ortho bw — cheap 1930s snapshot — would show a red bridge as white, but if it was fancy panchro then I’d be more inclined to agree with the AI, given the luminosity.
Panchromatic vs orthochromatic was still a choice even in the 70s. Spotmatics shipped with an ISO marker dial that included color, ortho, and panchro, 30 years after the Golden Gate Bridge was built.
Ortho bw — cheap 1930s snapshot — would show a red bridge as white, but if it was fancy panchro then I’d be more inclined to agree with the AI, given the luminosity.