Re: ISO / Noise / Megapixel


Then may I understand that probably the algorithm do not work like I am
supposing. I´ve tested and the noise seems to be the same at 8Mp or a 2Mp.


"Don Stauffer in Minnesota" <stauffer@xxxxxxxxxxxx> escribió en el mensaje
news:1190727439.656184.252260@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Sep 25, 6:44 am, Chris Malcolm <c...@xxxxxxxxxxxxxxxxx> wrote:
Fco <n...@xxxxxxxxxxxxxx> wrote:

thanks for the information,
I understand then that if I set my 8MP camera, to for example 2MP, the
noise algorithm probably will average 4pixels to create a single pixel.
In
this case, I should improve the SNR by reducing the resolution.
Is that correct?
If it is correct, probably I`ll never use 8MP. I'd prefer setting 4MP
if I
am not going to have large prints.

But you can get the best of both worlds by doing the noise reduction
averaging, if necessary, afterwards, in an image editor. Note that
you can also reduce noise by averaging the colours into black and
white.

--
Chris Malcolm c...@xxxxxxxxxxxxxxxxxxxx DoD #205
IPAB, Informatics, JCMB, King's Buildings, Edinburgh, EH9 3JZ, UK
[http://www.dai.ed.ac.uk/homes/cam/]

I concur. The averaging algorithm in the camera is likely to be quite
primitive. Good photo editors typically have a selection of
algorithms and adjustment of parameters for them. Gaussian blur is a
good example.






.

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