Checking hair color during a remote consultation

[LucasCoah]

I have an upcoming video consultation with a hair-color client because the client cannot visit the salon until the day we perform an in-person strand test. I need notes that remain useful when we later compare real swatches. The obvious limitation is that every screen shifts the colors while the reference photographs she sent were taken under several kinds of indoor lighting. I do not want to diagnose an exact season remotely, but I would like the conversation to narrow down sensible shade families before the appointment. I found this online color analysis to organize observations that we can verify later in person. Would matching one simple daylight setup improve the comparison, and is it worth comparing the same image on two devices during the call? I also plan to document old color, regrowth, and practical constraints. Which observations are safe to collect before an in-person assessment?