Originally posted by falconeye which is why I already accounted for in my previous thought experiment allowing for a margin to cope with noise clipping.
Well, but that's the whole point now, isn't it? The example demonstrates that you need to keep
less margin for preventing clipping with the larger-area pixels, which directly translates to a higher usable dynamic range.
Originally posted by falconeye However, it is entirely irrelevant for real world sensors. Even high resolution cameras have well capacities of 50,000 or even 70,000 per pixel. The effect you describe therefore is less than 0.5% (the math is in textbooks about statistics) or less than 0.01 EV. This is unmeasurable and as I said, irrelevant.
For the argument to hold it is not necessary to consider the FWC as the limiting factor. It still holds if the clipping happens elsewhere in the analog signal chain, as long as we ensure that for apples-to-apples comparison, the clipping threshold is at the same readout value for a given light intensity (i.e. it scales with the pixel area).
---------- Post added 07-30-15 at 06:23 PM ----------
Originally posted by normhead Where in that sentence did Dynamic Range become the topic of discussion?
I really hate it when I have to tell folks what they said, because they don't even know what they said.
I really hate it when people take things out of context, or worse, jump right in going on the offensive without having bothered to read any of it. This whole discussion (the recent part of it, anyway) is about whether there is a trade-off between resolution and dynamic range. Right above the part you excerpted because you had keyword-spotted the term 'resolution', I had written:
Quote: It's called a thought experiment. Full-well capacity of 1 per higher resolution pixel, 4 times that for the super-pixel covering the area of all 4 of them. Feel free to point out why this should not be comparing apples to apples.
With the terms 'full-well capacity' and 'clipping' showing up in the thought experiment, didn't that make it occur to you that all this was somehow related to dynamic range? Well, I really didn't want to make a big deal out of it, but just for the record... of the two of us, it wasn't me who called the other one obtuse.