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Google unveils new 10-shade skin tone scale to test its AI for bias

12.05.2022
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Alphabet Inc’s Google unveiled a palette of 10 skin tones on Wednesday that it described as a step forward in making gadgets and apps that better serve people of colour.

The company said its new Monk Skin Tone Scale replaces a flawed standard of six colours known as the Fitzpatrick Skin Type, which had become popular in the tech industry to assess whether smartwatch heart rate sensors, artificial intelligence systems including facial recognition, and other offerings show colour bias.

Tech researchers acknowledged that Fitzpatrick underrepresented people with darker skin. Reuters exclusively reported last year that Google was developing an alternative.

The company partnered with Harvard University sociologist Ellis Monk, who studies colourism and had felt dehumanised by cameras that failed to detect his face and reflect his skin tone.

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Monk said Fitzpatrick is great for classifying differences among lighter skin. But most people are darker, so he wanted a scale that “does a better job for the majority of the world,” he said.

Monk through Photoshop and other digital art tools curated 10 tones – a manageable number for people who help train and assess AI systems. 

Google’s Monk scale already in use

He and Google surveyed around 3,000 people across the United States and found that a significant number said a 10-point scale matched their skin as well as a 40-shade palette had.

Tulsee Doshi, head of product for Google’s responsible AI team, called the Monk scale “a good balance between being representative and being tractable”.

Google is already applying it. Beauty-related Google Images searches such as “bridal makeup looks” now allow filtering results based on Monk.

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Image searches such as “cute babies” now show photos with varying skin tones.

The Monk scale also is being deployed to ensure a range of people are satisfied with filter options in Google Photos and that the company’s face-matching software is not biased.

Still, Doshi said problems could seep into products if companies do not have enough data on each of the tones, or if the people or tools used to classify others’ skin are biased by lighting differences or personal perceptions.

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