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 images from the Sony Cyber-shot HX20V have similar signal to noise ratio (SNR) results to the Panasonic TZ30 at mid-range sensitivities (ISOs). After that is doesn't perform as well, although it's consistently better than the Fujifilm F770 EXR. The very high SNR values at the highest sensitivity settings are the result of heavy smoothing which takes out all of the noise at the expense of detail.