The test scene
See the Processing page for how the files were processed.
Be sure to read the note on viewing images in your browser. Especially important is the Safari image display bug in dark tones.
The D3x has higher noise per pixel than the D3, but the D3x also has twice as many pixels, or 1.421 times as many pixels linearly. With similar sensor technology, the D3x should have the same light-gathering ability, and therefore downsampling should provide at least as good noise characteristics, while at the same time reducing the digital artifacts introduced by Bayer matrix demosaicing: the net effect should be overall higher total image quality from the D3x.
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Histograms for crop in ProPhotoRGB, AdobeRGB, sRGB
The sRGB image pins blacks and clips highlights in the red channel