Add a vividity threshold to sorting algorithm?

[oaustegard]

Concern: a lot of "not rich" (black, gray, white-ish) colors show up in each band.

Should these be filtered out into their own class and thus displayed in a group before/after the rainbow? Should the color-extraction algorithm account for this as well, so that say the Queen album and the Banana album are not considered brown and yellow but rather "black" and "gray"?