From DXOMark: More pixels offsets noise3

Started May 30, 2009 | Discussions thread
John Sheehy Forum Pro • Posts: 21,549
Re: Yes, a bit tricky..

Steen Bay wrote:

I still use my 'old' 40D. Can't afford, or justify, to update every
year, but I'm sure that the 50D is the better camera, and I'm looking
forward to a 18-20mp 60D, which I'll probably get. And yes, comparing
cameras and images can be a bit tricky, which all these long threads
should prove

Well, there are a lot of logical traps to fall into. Most people seem to have a very difficult time adapting one paradigm when they've already adapted another, and are incapable of recognizing the superioirity of the new one.

If we had 200MP monitors, we would be viewing the output of all cameras (and crops we make from them, unless very small and intended for small web images) full-screen on the monitor. Cameras which had many more pixels, but softer and noisier at the pixel level, would look more detailed in a more natural, non-aliased way, and would be less noisy or the same in most cases.

Printers get us closer to reality (when printing images at the same size), but they are still flawed in some ways.

Now, higher pixel counts suggest that you may be able to crop deeper or display/print larger, as is sometimes the case, but the ability to do so is above and beyond the standardized concept of image quality. People who expect the same quality doing so are unrealistic; only the most superior optics, focus, and camera stability, and shooting at low ISOs, allow that. And the results must be compared to cropping a lower-density camera just as deeply, or displaying the image just as large. To use the pixel level as the limit for comparing cropping or maximum display size is nonsense; the "unity" is an illusion.

Is there really a problem with camera B, because camera A looks better per unit of displayed area one foot from your face printed much smaller? That's ridiculous, yet that is the foundation of the pixel-centrics.

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John

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tko
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