I've looked very carefully trough the MIR Manual. I didn't find anything about some possibilties to adjust the optical brightness of the venue view. In the Foyer it is quite impossible to see the raster, cause it is very bright. So it's quite heavy to see the white raster-lines or almost impossible, beside my old bad eyes ;-) Actually they are helpful, but don't help in this way. Maybe the raster-lines can be made more grey or maybe better in a light-blue? Or it is possible to adjust the contrast?
Kind regards
Frank