Measuring Mach-E Window Tint With Just A Camera

I want to know the factory tint on my new 2024 Mach-E’s windows, but I didn’t want to spend $80 on a meter I’d use once or twice in the next 10 years, so I took the following pictures of computer paper both inside and outside, front and back:

Side by side images of inside+outside computer paper on my front and rear passenger windows

Per ChatGPT’s suggestion, I sampled the light and dark sections in RawDigger then let ChatGPT do the math: https://chatgpt.com/share/6a384635-1740-83e8-973d-97e5d24ce6ed (copy at the bottom for inline viewing)

It calculated that the dark section was 4.5% as bright as the light section on the rear glass, but since this is double-bounce attenuation (the paper on the inside is light by sunlight attenuated by the glass, then it’s attenuated in the other direction too), that works out to 21% VLT for the rear windows, which agrees with internet numbers.

With the front window, it worked out to 75% VLT. So 28% VLT film on the front would match the back, but 30 would be slightly lighter.

In process on the front window:

"outside" selection analyzed in rawdigger on front window
"Inside" selection analyzed in rawdigger on front window

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