Building a more inclusive way to search

Detecting a skin tone in an image is a challenging problem, because it depends a lot on lighting, shadows, how prominent a face is, blurriness, and many other factors. The most accurate way to detect a skin tone in a Pin’s image would be to have a human label every single Pin image according to a scientific skin tone palette. But with billions of unique images, and many more created each day, that’s an expensive approach that would be hard to scale.

https://medium.com/pinterest-engineering/building-a-more-inclusive-way-to-search-789f4c92fd73