The extracted colors were used in a few different ways:
1. product search - show me "red" shirts.
We also mapped certain hues to "saturated", "muted", "pastel" etc... meta colors based on HSV values. Unfortunately, we never got to surfacing these meta colors as search facets.
2. similar product recommendations - show me shirts similar to this one. colors (and meta colors like "muted") were one of the features used in similar product recs.
3. analytics - turquoise is "trending"