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Forum: Pentax K-1 & K-1 II
08-22-2016, 04:39 PM
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Actually, both the sensor size and the pixel size ARE part of the DxO normalization, since the quantity they use to normalize by, N=number of pixels, is almost exactly the ratio of sensor area to pixel area (moreso for recent sensors than those from the early days when there would be more wasted space around each pixel -- now the wasted space is quite negligible)! (I made a similar comment before, here: https://www.pentaxforums.com/forums/169-pentax-full-frame/315763-k-1-so-what-...ml#post3577426 )
The intention of the print score is to be able to compare sensors fairly. As DxO says "Normalizing by pixel resolution makes it possible to compare actual sensor performance, similar to printing two images on the same printer." This is much more useful than simply comparing per-pixel performance.
If the DxO print score was instead calculated using a normalization based around the ratio of pixel area, rather than #pixels, THEN it would be true that it would not be affected by sensor size at all. But that would be silly, as it wouldn't serve the intended purpose of their normalization. They already have the screen score which is the one that only depends on pixel area.
Further emphasis of why users should pay attention to Print sensor scores rather than Screen scores when comparing sensors (from http://www.dxomark.com/Reviews/DxOMark-Camera-Sensor2/How-fair-is-DxOMark):
"Print versus Screen modeTo compare DxOMark Camera Sensor scores between cameras with different resolutions, you need to look at the “Print” results. The overall DxOMark Camera Sensor score is “Print” level only, which is fine. For the next level of detail a viewer gets to choose between Print and Screen. This is less fine: Screen is not normally useful for end users (it can be useful for debugging your own calculations). The lowest level of data is presented in “Screen” mode only, but is not labeled as such. I would prefer to see all data to be labeled Print/Screen or –better yet– Normal/100%. Normal would stress that this is what matters. And 100% is similar to pixel peeping: here you look at the noise at the 100% crop level and loose the overview of what it means at the image level."
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