Darkly adv. : With imperfect light, clearness, or knowledge; obscurely; dimly; blindly; uncertainly.

Darkly adv. : With a dark, gloomy, cruel, or menacing look.

Example:
what can you do to lighten a Darkly painted room?

Taxonomy
A Scanner Darkly, Linklater, animation, Substance D, Barris, 07-29, Hank, Richard Linklater, animators, the police, Fred, Donna, Hawthorne, New Path, suit, Freck, rotoscoping, Keanu Reeves.

Defination from the web:
Darkly, with information about its rotoscoping technique and trivia about the making the movie.