dlvh said:
Another quandary...When theaters played the movies in the day, how does one determine, or even know, what equipment was used to display said movie in said theater? Was there only one professional projector used for every theater in this, and other lands? If a certain projector used a certain type of bulb, or other piece of equipment, could that have tainted the way the filmed look in any way? Is it possible that the screen itself could have displayed the image differently from one theater to another?
Yes. Approximation, average and compromises must be found, but correcting for a typical 70s bulb is definitely necessary.