So I have a Fujifilm XT4- I have a read error that popped up maybe 4 days ago or so now. It's frustrating bc I can't shoot video on my camera. 5 seconds into shooting... the video stops and it says "Read Error". How do I fix this? I already reformatted the SD cards (both of them) like 2 times each. What gives?
I do not see a brightness button on the back in your image, but if it has a button whose emblem is a circle with a lot of lines popping out from it, Fujifilm usually uses that as a lcd brightness controller. Do you have the manual for the camera? If you have an external card reader, the video and images on the SD card can be copied over to your computer.
This may help you some:
DarkTable: https://www.darktable.org/2019/05/new-module-lut3d/ also has some tools for doing that type of work. Yeah, shoot in raw is a good idea, but stuff happens.