View single post by cnmark
 Posted: Sun Jun 24th, 2007 01:58 pm
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cnmark



Joined: Mon Apr 2nd, 2007
Location: Hong Kong, Macau, Zhuhai
Posts: 115
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pacifichrono wrote:

Nice Lumix.  I don't see the "noise" though.  I'm anxious to try out the Canon with my light box, maybe later this week.




Hi Tom,

First, I am spoiled, because I mainly shoot with my DSLR and there is no noise problem.

And trying to explain sensor noise ain't easy. Your pictures nearly show no noise, while mine show quite a lot.

All pocket digicams do have a noise problem, some more, some less - it's caused by the tiny sensors used in these cameras. Your ELPH with 7.1 MP and roughly the same sensor size as my LUMIX with 10 MP must have a superior noise performance. Just because the single pixels on your sensor are larger, and not as much signal amplification is required.

The effect of sensor noise is about same as the "grain" we had on film.

2 crops from my wristshot above in 100% size (as from the cam) will do the explanation of "noise":

1. with noise, see the grainy appearance in the unsharp areas, so the noise performance of my LUMIX ain't particular great.


2. same shot without noise (removed with Paint Shop Pro X):


Though the advertising campaigns of the camera industry do suggest the opposite, in fact more megapixels do not automatically give better images. Too much other factors are incolved.

P.S.
And as we are just showing off our small ones, here's my son, greeting all of you while riding a peacock:

(And yes, this shot was denoised before posting)