Film doesn’t have a pixel resolution as such. The size of the silver grains determines the quality of the image and that depends on film type and development. At highest quality you could get something around 200 lines per millimetre. A line in that context is a transition from black to white so that would need two digital pixels. Nevettheless, on the largest cinema film, 70mm, thats around 14000 lines across the frame but that would not necessarily be reasonable because other factors come into play. On top of that, the images are formed differently with overlapping dye layers rather than separate RGB sensors in an array so comparisons are not directly transferable.
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