I am using GH4 video 0-255 luminance levels.   It is quite confusing because some players shows only normal 16-235 levels and some editors does not use 0-255 properly. Some say 16-235 is better for codec (less information to process- more bitrate to details) etc etc. Graphic cards has full range/limited range (16-235) settings...   If I watch my GH4 0-255 videos with Potplayer I must set in levels settings: input 0-255,  output 16-235 to see all details in highs and lows.   Why must I use output