Higher amount of megapixels = lower visible noise?

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DeathArrow Contributing Member • Posts: 860
Higher amount of megapixels = lower visible noise?
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Would having a higher amount of megapixels produce less noise assuming the output size after post processing is the same, the senzor size and sensor technology is the same, the lens can resolve both resolutions equally good and there is some denoising software used during post processing?

To take an example, let´s say we have 2 sensor of identical sizes, using identical sensor tech, one with 12 megapixels and one with 24 megapixels. Let´s assume we use a lens that can resolve the same percent of total resolution on both sensors. Let´s assume that we want to output a file with a 2 megapixels resolution after postprocessing.

Also, let's asume we have visible noise, and we used the same settings for images shot with both sensors.

SInce the sensor size and sensor tech is the same, settings are the same, the ammount of noise for both shots would be the same.

But wouldn´t be possible to use more aggresive noise reduction on the 24 megapixel file, have the same final sharpness as in the output from the 12 megapixel file and less visible noise?

I may be wrong, but that´s the downside when using noise reduction in software: you lose details.

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