"but if the brightness/contrast were set wrong when the capture was recorded, it won't truly represent the source laserdisc. If you play the disc itself on a properly calibrated TV, are these lines visible then? Some adjustment may be required to get a good "grey scale" - if the contrast is set too high then you lose the division between very light grey and white."

Agreed. If your own equipment isn't calibrated, then there's no telling how it's going to look on other people's displays. That being said, most other people's displays aren't calibrated either, but in that case, they can't blame the bad picture on you.