more pixels are better!

Started Dec 14, 2008 | Discussions thread
DaSonyGuy Forum Pro • Posts: 12,351
More pixels are not necessarily better...

Iforgetwhat8was4 wrote:

or are they?

Could someone try to give a clear but comprehensive explanation of
why more Mp doesn't improve IQ?

Given a fixed sensor size the camera with higher "resolution" will produce a physically larger image than one with lower "resolution" but one that is noisier and has reduced image quality, because smaller photosites equal more noise, fact.

I understand that more pixels means more noisy pixels, and i've seen
that in my own cameras.

Well then why do need to ask?

But should twice as many pixels give twice the dynamic range, simply
because you could sample two pixels for a value with twice the range
of a single pixel?

Completely the opposite. A single Bayer pixel is actually the combined output of at least four adjacent photosites, often more...Make the photosites smaller by increasing the "resolution" and it just increases noise whilst allowing slightly more detail to be captured (and I do mean slightly more) its normally at the expense of pixel level image quality....There is no such thing as a free lunch.

Isn't it a question of whether NR is losing detail that wouldn't be
there in the first place with less pixels?

Noise reduction does indeed reduce resolution but you have to trade that off with being able to capture usable shots...A clean low res shot can be more usable than a noisy high res shot...Everything is a compromise.

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