Does anyone know what he _HIGH file is used for? I have never seen it used in game.
Also the _LOW is used for the in game minimap so creating a 360 pixel sized image will create a blurred image when using the full screen tac map.
What I see currently in game is:
_PREV - Usually 50% size or 384px image. Used for map selection and loading.
_LOW - Used for in game minimap. Should be based on the 768px image.
PREV - may mean PREVIEW
LOW - Low Resolution in game minimap.
HIGH - I am guessing _HIGH was used for the full screen minimap at one point, but it does not appear to be used there anymore.
The current RELIC file descriptions back up my assessment of the files:
Essence Engine Wiki