brainiac wrote:
...forget the assumptions: one BIG error has been made. Two 10% inaccurate pixels are significantly more accurate than one 10% inaccurate pixel. So smaller pixels can afford to be less accurate by some margin, in order to produce the same result. \"This is physics\". These days this means that added resolution has very very little downside. The \"keep the pixels few\" crowd are not just ignoring the technological advances, they are also not doing their arithmetic correctly.
If you\'re going to say things like \"this is physics\", it would be a good idea to actually get your statistical analysis right, otherwise it\'s not physics, it\'s fantasy. I\'m afraid that Etadam is still offering a per pixel analysis which fails to take into account the macroscopic effect. Colour accuracy is not a distinct problem.
Considering the same technology:
- A 1 pixel occupying the space (sum of sites areas) of 2x2 pixels will be likely to have less noise than the sum of the noise of the 4 pixels. This is particle physics (and mathematics).
- Inversely a 2x2 matrix of pixels scaled to the size of 1 pixel will have a fair probability to yield a noise similar to the one of the pixel of the size of the 2x2, because the noise is random and is likely to be reduced during the scaling process.)
So Two 10% inaccurate pixels are significantly more accurate than one 10% inaccurate pixel. Assuming the 2 pixels are twice the size of the \"one\" pixel this is
- either wrong
- or they\'re the same size implying that the 2p and 1p are not from the same technology, and this is another problem
If they are from the same technology, the noise % being 10% for the 1x1 case, would be less for the 2x1 pixel.
Downscaling an image reduces the noise? Yes, it was in my initial post. So what is the point?
Buying many pixels to be able to downscale for the noise? Why not - many pixels have other advantages (big prints where not only noise but also resolution matters).
Personally In this case, with the same sensor technology, I\'d prefer purchase less and bigger pixels, [I don\'t need 20MP]: same noise rendering and faster processing, backups, less disk/cards etc...
Considering the same technology: