Pixel density revisited

Started Oct 22, 2008 | Discussions thread
bobn2 Forum Pro • Posts: 61,414
Re: Pixel density revisited

natureman wrote:

bobn2 wrote:

Phil Askey wrote:

I think a 30+ page review correctly qualifies any statement about
pixel density and noise. Where is this reverse evidence?

It could be any length, but if it didn't contain any statements
relating noise content to final output size, it wouldn't be
qualified, would it? I've read through it quite carefully, and I
can't find any pointer there that would help me understand the
relative noise between the cameras for usual output sizes. There are
a lot of statements about how noisy the A900 is, but all related to
per pixel noise.

There's nothing "absolute" about "final output sizes". 100%
magnification is "absolute" and "qualified" and so is "per pixel

I agree with the first part of the statement - of course, since final output sizes vary, there is nothing absolute. I disagree strongly with the second, there is nothing 'absolute' either about 100% or per pixel noise. For a start, the 'pixel' you are looking at on the screen is an amalgam of data from a number of sensor elements, combined together using an algorithm you know nothing of, with unknown effects on the noise. As for qualified, that depends on the qualifications, and 'per pixel noise' is not qualified in an easily understandable way to the level or quality of noise apparent in a viewed image.

Really, you are playing around with semantics, both in your use of 'absolute' here, and 'fair' in previous posts. Big words like 'absolute' and 'fair' sound fine and dandy, but, as I've tried to point out before, for comparative reviews what's important is usefulness and objectivity. Given that most people (admittedly not all) buy cameras as devices for taking photographs, a useful test is one that gives a clear indication of the likely quality of those photographs and an objective test is one that produces an unbiased assessment of the likely quality of those photographs. The measuring and emphasising of tests that do not directly relate to output image quality and then asserting that they do fails on both counts.

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