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
These results show that the Sigma DP1 Merrill's JPEG files have a low signal to noise ratio when compared to those from the with the Panasonic LX7, Fuji X100 and Olympus XZ-2, coming in just above the Olympus at ISO 100-200, and bottom of the pile at the higher sensitivities that it was able to reach.
Raw signal to noise ratio
The signal to noise ratios of the TIFF images (after conversion from raw) from the Sigma DP1 Merrill are slightly stronger, beating the Panasonic LX7 throughout its whole sensitivity range, and the Olympus XZ-2 at ISO 100-200. It produced weaker results than the Fuji X100 at every ISO setting, however.
JPEG dynamic range
Raw dynamic range
This chart indicates that TIFF images (after conversion from raw) from the Sigma DP1 Merrill are second-strongest at ISO 100-400, sitting just below the Olympus XZ-2 and above the Panasonic LX7 and Fuji X100. It comes out top at ISO 800, the top of its measurable range.