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
JPEG images from the Pentax VS20 that lag behind the Canon IXUS 220 HS, Fujifilm F600 and Canon PowerShot A4000 for signal to noise ratio (SNR). Although the charts shows better SNR above a sensitivity of ISO 1600, this result is due to the smoothing of detail and lack of quality in the images taken a ISO 1600, 3200 and 6400.
JPEG dynamic range
This chart shows that the Pentax has a lower dynamic range than Canon IXUS 220HS, Fujifilm F600 and Canon PowerShot A4000. At a sensitivity of ISO 800 the chart does show a jump in dynamic range just beating the Fujifilm F600, however from ISO 200 the VS20 could easily loose tonal graduation in both the shadows and highlights.