Grayscale emulation possible?

[jose1711]

Would video player be able to emulate grayscale as in https://www.reddit.com/r/flipperzero/comments/10uocof/update_on_grayscale_emulation_more_details_in/ or https://www.reddit.com/r/flipperzero/comments/10qztme/my_next_project_is_grayscale_emulation_for_the/?

[LTVA1]

I am not sure, because it requires precise timing while video player spends a lot of time reading data from SD card and drawing it. I was actually experimenting with alternating checkerboard pattern dithering, running it off hardware interrupt and with direct draw, but it still flickered no matter how I tried. I would ask the author of greyscale camera app to actually shoot a video showcasing the greyscale, since with appropriate shutter speed ypu can capture good looking photo of it, but in reality it most probably flickers.

By the way, the speed at which LCD pixels change their color depends on the temperature too.