Originally posted by dtmateojr Resampling isn't really fair.
It actually is quite a bit more fair than showing a higher-resolution sensor at it's greater native magnification, and then trying to extrapolate what overall image noise would look like from that.
The only time it wouldn't be fair is if you bought the higher-MP camera
to shoot larger - then it would be accurate to look closer to 100% to get an indication of what to expect.
If you don't print or display at larger sizes than before, you need to re-sample to get an accurate view.
Quote: It has always been a trade off of noise vs resolution. You can't have both. You are supposed to view each image in their intended size.
Yes,
intended size - like 8x10, 11x16, or some screen resolution like 2048p-width, whatever size you choose - When you do that, you're re-sampling one, or the other (or both.) This is the comparison you want to make, not a 100% pixel view. And this is why DxoMark does that. You can read more about it here:
Contrary to conventional wisdom, higher resolution actually compensates for noise. Quote: If I am to upsize 12mp to 36mp then it follows that I will need a larger sensor for the 12mp to maintain the same sensor sampling rate. Their methodology is wrong.
No, it's not wrong, and they show SNR measurements for both methods (area sample = 'screen', normalized sample = 'print',) and their score is based on the 'print', as that's normalized to an equal display size and is exactly indicative of what photographers do. This isn't anything controversial, and their methodology and reasons are widely accepted - please read that link.
I have personal experience with this - I had a D700 and bought a D800, intending to keep both. I was going to use the D700 as my 'low light' shooter because I expected it to have better noise performance, and that my D800 would be my 'outdoor' body. I kept noticing that at the same display sizes, the D800 really didn't show any more noise, and depending on the sampling, retained more detail still. What's more, the noise it had was finer-grained, just looked more natural and better to me. I still kept the D700 for a year because it's a fantastic camera and I liked having two bodies with me at times.
Here's a typical example:
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I have some of my own examples as well.
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