Brightness is assumed to have a maximum of 100

[digitaltrails]

Some of the code assumes VDU brightness maximum will be no greater than 100%. So far this has turned to be true, but there exists the possibility that there is a VDU out there using a different scale. I think there is at least one VDU that uses a larger scale for contrast/dynamic-range.

It would be good to track down any parts of the code that rely on 100 as the maximum and assess what to do about it.

Ambient brightness profiles range 1..100. It's possible that the actual brightness range could be mapped onto 1..100 for the purposes of creating a brightness profile. That would have the advantage of the profiles for all VDUs having a common scale - which is probably the only way the current plot would remain workable.