Apparently filmmaker mode is an industry-wide thing, and [their website](https://filmmakermode.com/about/) is fairly informative.
The TLDR is that modern TVs do a lot of image processing to “enhance” whatever content you’re playing. Filmmaker mode is basically “turn all that stuff off, display the video as neutrally as possible, let the original filmmaker’s artistic choices come through”. When you’re watching, say, Amelie, The Grand Budapest Hotel, or [Hero](https://newhouseinsider.syr.edu/2017/11/a-look-at-the-color-narrative-in-hero/), the last thing you want is to mess with the work the cinematographer/editor/director put into getting those colours.
Cinema mode is whatever the manufacturer wants it to be, but tends to have all the image processing stuff running to make the experience “more vivid”, or whatever they market it as.
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