Blue Noise

What Does Blue Noise Mean?

Blue noise increases in volume with increasing frequency, but at a lower rate than a similar kind of noise called violet noise.


Blue noise is also known as azure noise.

Techopedia Explains Blue Noise

Blue noise is one of many terms for different kinds of noise that operate differently across the noise frequency spectrum. Blue noise is characterized as a noise with a less intense frequency increase than purple noise. It can also be contrasted to pink noise, where intensity decreases by a similar margin over a finite frequency range. That relative increase and decrease is 3 decibels per octave.

In terms of its use, blue noise is sometimes used for randomization or pattern projection, such as in digital images utilizing or transitioning from grayscale. For example, a strategy called dithering is used in audio and video processes to help to project different changes to images. Blue noise can be useful in dithering because of its logarithmic function.


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Margaret Rouse

Margaret Rouse is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical, business audience. Over the past twenty years her explanations have appeared on TechTarget websites and she's been cited as an authority in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine and Discovery Magazine.Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages. If you have a suggestion for a new definition or how to improve a technical explanation, please email Margaret or contact her…