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
This graph shows that the Nikon Coolpix L820's JPEG files have significantly stronger signal to noise ratios than JPEGs from the Olympus SP-820UZ and Sony HX300 at every sensitivity setting, but slightly weaker ratios than those found in the Canon PowerShot SX50 HS's JPEGs.
JPEG dynamic range
Similarly, the Nikon Coolpix L820's JPEGs have greater dynamic range than the Olympus SP-820UZ and Sony HX300's JPEGs, but weaker dynamic range than the Canon PowerShot SX50 HS's JPEGs at every sensitivity setting. Results here are slightly less spread out than they were for signal to noise ratios, with theSony coming close to the Nikon's scores at ISO 200 and 3200.