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Work in the lab

Theoretically, the Lab color space contains every color the human eye can see and the entire gamut of RGB and CMYK. It's an excellent color space for editing digital images, as it doesn't have some of the color limitations of the other color spaces. Lab color comes in quite handy when targeting noise, as it breaks down the image into specific criteria.

The Lab color space is comprised of a luminosity channel and two chromatic ranges, called a and b. The luminosity channel represents the black and white information in your image, as well as the lightness. The a channel basically contains your greens through red, while the b channel ranges from blue to yellow. Since digital noise is contained in the chromatic channels, we can edit the a and b channels while keeping our black and white detail intact. Otherwise, we'd have to adjust either a single color channel (Red, Green, or Blue) or the entire image, making it harder to preserve image detail while reducing noise.


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