All image noise comes down


All image noise comes down Luma or chroma noise.

Luma noise is created when the signal is lower than the sensor gain, or signal to noise ratio. What does that mean? It means that when your camera increases sensor sensitivity it does it by adding electricity to the sensor to detect more but the more electricity added the more a base signal is added to the recording which is what you see as noise in the image. If photons then activate a sensors pixel that pixels noise is overwritten by the light detected. This is what’s known as higher signal than noise ratio, but if the signal of the incoming light is lower than the electrical gain applied to the sensor you get noise recorded instead of the signal because the noise is brighter pixel value than the any signal detected.

All that means that you need have enough light coming into the camera to overwrite the gain or noise created by the iso or gain applied to the sensor.

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