Another DxO Data Point (Legit this time)

Started Mar 23, 2012 | Discussions thread
ARTASHES Regular Member • Posts: 167
Re: Something's not right with DXOmark's Sports rating...

SpartanWarrior wrote:
Pretty soon you all are going to be resizing the D800 to 2 mp.


PhilPreston3072 wrote:

I've got to admit the D800's sensor is pretty impressive for having low noise with high resolution.

But DXOmark's low light score doesn't seem to add up when you compare it to DPReview's RAW comparison widget. I'm quite sure the D700 performs much better noisewise than the D800 when looking at RAWs on DPReview.

Resize all samples to 8mpx to have some similarity with DxO scores and and then better DR gives bigger room to D800 to have better ISO low light performance (sport) which you cant see on DPR samples images

Read this

"Different DSLRs offer resolutions ranging from about 6 up to 24Mpix (with higher resolutions to come). Higher-resolution sensors offer more detail, but their smaller pixel size often leads to higher noise levels, and consequently to lower dynamic range, tonal range, and color sensitivity. When printing under identical conditions, however, the performance differences can be either mitigated or accentuated by the choice of print size.

When one compares an 8Mpix image with a 32Mpix image printed on identical 20x30cm paper at 300dpi, the measurements for the original image do not give a good indication of the final result. The 8Mpix image will require no interpolation (2300 pixels for 20cm, or roughly 8 inches), while the 32MPix image will have to be reduced significantly, with 4 original pixels averaged into a single pixel. This averaging operation will significantly reduce the noise in the 32Mpix, and accordingly improves the measurements provided for the original resolution.

Original measurements can help gauge image quality when viewed at 100%, but to better predict how prints will compare, we provide a normalized (and thus more reliable) version based on 8Mpix."

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