Fermion: TCS3430 Tristimulus Color Sensor (Breakout)
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Devices with True Tone technology like Apple iPad Pro, iPhone, and Macs usually feature sensors that measure the ambient light color and brightness. The device then uses this information to automatically adjust its display, so it can correct white points and illumination based on your environmental lighting in order to render the right kinds of white under any conditions. And XYZ Tristimulus Color Sensor plays an important role in this technology.
TCS3430 features advanced digital ambient light sensing(ALS) and CIE 1931 tristimulus color sensing(XYZ). CIE1931 XYZ Tristimulus model is a kind of standard based on three different human cone cell types. The CIE XYZ color space encompasses all color sensations that are visible to a person with average eyesight. The spectral response of TCS3430 is almost the same as that of human eyes, which can realize the high-precision measurement of illumination and color temperature. What you see is what you measure!
The TCS3430 Tristimulus Color Sensor is ideally suited for the use in smartphone applications to improve color measurement and intensity of ambient light conditions. Also, it can be used in scenarios requiring a true-color viewing experience like online shopping (product color matching, reducing the return rate caused by color difference of images and real product).
You can learn more about the CIE 1931-XYZ system here: https://en.wikipedia.org/wiki/CIE_1931_color_space