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Michael Tsai – Blog – Color areas



Bartosz Ciechanowski:

A color space can indicate how numerical values ​​for the red, green and blue components map the intensity of the corresponding light source. In other words, the position of a slider cannot be equal to the intensity of the light controlled by the slider.

[…]

This may seem like a meaningless transformation, but there is a good reason to do all this non-linear mapping. The human eye is not a simple detector of the incoming light power – its response is non-linear. A two-fold increase in the emitted number of photons per second, will not be perceived as twice as strong light.

If we were to encode the colors using floating point numbers, the need for a non-linear coding function would be reduced. However, numerical values ​​of color are often encoded using the known 8 bits per component, e.g. in the most common JPEG and PNG file configurations. By using a non-linear toner response curve or TRC for short, we can maintain more or less perceptual uniformity and use the bulky, quantized area to keep the details in the darker parts. [1

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