EXR Confusion not fully resolved

Started Jan 25, 2014 | Discussions thread
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Timur Born
Senior MemberPosts: 4,450Gear list
Re: EXR Confusion not fully resolved
In reply to photoreddi, Jan 26, 2014

photoreddi wrote:

No, you relish trying to correct people but in this case it's YOU that are wrong.

I relish my daughter getting healthy, not correcting people on an anonymous forum.

You're talking about the entire sensor, ignoring or not recognizing that I wrote this :

On a pixel basis the larger M size pixels capture more photons so their DR will be greater than the L size pixels (substitute photosites for pixels here if you prefer.)

But you are right, I puzzled up your "pixel basis" statement with a "sensor basis" one. Sorry for that.

Now if you can demonstrate that M size pixels are the same size as L size pixels then maybe you have a point to make.

Here I have to disagree again, though. M size pixels are the same as L size pixels, it's still a 12 mp sensor capturing 12 mp data. It is not a 6 mp sensor where each pixel has a deeper photon well with higher linear dynamic range. Instead the 12 mp pixels are averaged down to 6 mp and then demosaiced, they are not summed up to a higher signal strength. Averaging lowers noise and thus increases signal-to-noise ratio.

You can do the very same using an L size image and downsizing it after demosaicing. The benefit of the EXR sensor based averaging is that only pixels of same filter-color and very close proximity (nearly showing the same information) are averaged. You can get an idea of post-demosaicing results by looking at the measurements of the FinePix-F800EXR at DxOmark, comparing Screen (16 mp pixel) vs. Print (8 mp averaged) results.


That you appear to be supporting Joms's unsupportable statements is interesting if not amusing. Great minds think alike, or so they say.

I assume this is meant to be an intelligent but snide remark. People on this forum always amaze me with their blatant demonstration of human nature.

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