I think its something to do with the way the physical display works…
all my modules use black, but depending on how many other objects/colours are used, Ive noticed the background looks more or less black/grey.
so I think PLY just looks darker, because its only using a couple of colours, and large areas are black.
put another way… I think the code for all the modules are using black as a background, it just ‘appears’ different.
(I think the same is also true for the boot up text that Neil mentions)
Id guess that backlight could be adjusted, but I suspect that Bert choose this level after trying different levels to get a nice ‘bright’ display without too much overspill
(I think he mentioned something about this in previous posts)
sorry… I dont know off hand how a user could change this… or if it’s possible… as we’d need to look at how the hardware panel is configured in linux at a pretty low level.