Oh yeah, CTRL+click highlights a net and ALT+click highlights a component.
I think I was confused by your use of "hue", which is color (red-green-blue). The intensity is the luminosity, which is how this highlighting works. (That leaves saturation, which is how intense the color is; masked objects are set to gray, i.e. zero saturation.)
Brackets [ ] change the background level while highlighted, or the | Snap | Mask Level | Clear | buttons in the bottom-right access menus for this (and snap things, and Clear is just SHIFT+C).
Tim