We shoot a specially designed chart in carefully controlled conditions and the resulting images are analysed using DXO Analyzer software to generate the data to produce the graphs below.
A high signal to noise ratio (SNR) indicates a cleaner and better quality image.
For more more details on how to interpret our test data, check out our full explanation of our noise and dynamic range tests.
JPEG Signal to noise ratio
TIFF images (after conversion from raw) show that the Nikon D4, has better signal to noise ratio than all but the Canon EOS 5D MK II between ISO 1600 and 6400. The Nikon D700 also just betters the D4 in this test at ISO 6400.
JPEG Dynamic range
This chart indicates that the Nikon D4's JPEGs have at least a 1EV higher dynamic range than the comparison cameras across the greater part of the sensitivity range.
Raw Dynamic range
TIFF images (after conversion from raw) from the Nikon D4 have a greater dynamic range than the Canon EOS 1D MK IV, Nikon D700 and Canon EOS 5D MK II with only the Nikon D3x gaining a similar result at ISO 100.