We shoot a specially designed chart in carefully controlled conditions and the resulting images are analysed using the 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.
Nikon Coolpix S3100 Signal to Noise Ratio (SNR)
All three cameras have the same sized sensor (1/2.3in), but while the S3100 and Pentax RS1500 have a pixel count of 14 million, the Canon A800 has 10 million pixels and the Nikon Coolpix S8200 16.79. Nevertheless, the Nikon S8200 rules the roost in the middle of the sensitivity range, while Pentax RS15 produces the cleanest images at the highest sensitivity settings.
Nikon Coolpix S3100 Dynamic Range
A high dynamic range indicates a better ability to reproduce a wide range of tones. These cameras do not produce raw files, only JPEGs which are automatically processed in-camera to produce the best image possible in the view of the manufacturer.