Dynamic Range -- what it is, what it's good for, and how much you 'need'

Started Oct 17, 2011 | Discussions thread
Nemianiu Skqergl
Regular MemberPosts: 156
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Re: A prime example...
In reply to FrankyM, Oct 18, 2011

FrankyM wrote:

Great Bustard wrote:

If you understood what DR was, then you'd not be confused on this point. Would you like me to explain to you how it works out? Specifically, why neither sensor size nor pixel size figures into the calculation of DR?

Maybe you should explain it to Chuck Westfall, Technical Advisor in Canon USA's Pro Engineering and Solutions Division. who says

mr westfall's job title is 'director of media and consumer relations'.

http://www.dpreview.com/articles/5149972341/canon-eos-1d-x-overview

'There's a couple of things that we consider when we think about IQ: number one on this sensor is noise. It's clear the noise level is better than in the 1D Mk IV or the 1DS III. The pixel size is larger than in the 1DS III or 5D Mark II (6.95 microns, versus 6.4) and the difference is even more striking compared to the 5.7 micron pixels in the 1D Mark IV. That helps us in terms of light capturing ability and increases the signal to noise ratio. In turn, that does nothing but help the dynamic range of the camera. '

mr westfall is there to make the best out of whatever canon does. here is a previous interview with mr westfall, about the 1diii

http://www.digitalcamerainfo.com/content/DCI-Interview-Chuck-Westfall-Canon ’s-director-of-media-and-consumer-relations-discusses-the-EOS-1D-Mark-III-.htm

two qotes

DCI : What went into the decision to stay with the APS-sized chip instead of boosting up to a full frame?

Westfall : We wanted to have10 frames per second capability. We didn’t want to drastically increase the pixel size to get that. If we were to have gone to a full frame sensor, we wouldn’t have been able to stay at 10fps if the pixel size was the same. We would have had more pixels at a full frame. This is like the sweet spot of being able to have a good balance of the resolution of the sensor and the fps capability that we were able to achieve.

seems not to apply any more. rules changed?

DCI : The camera also includes a new sRAW file format. How are these smaller files generated, and are they completely lossless?

Westfall : They are completely lossless. The information we have is somewhat limited. One of the things we do know is that is using a binning technique. That is the reason why it is one-fourth the resolution of the full sensor. It’s not down-sampling like a JPEG file . With that binning technique, that’s how we were able to do it. By keeping the file the same as regular full size RAW, all the image manipulation that can take place with a regular size RAW file can be done with a sRAW.

what sraw is is exactly downsampling like a jpeg file - see here
http://lclevy.free.fr/cr2/#sraw

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