These graphs were produced using data generated by DXO Analyzer.
We shoot a specially designed chart in carefully controlled conditions and the resulting images are analysed using the DXO software.
Signal to noise ratio
A high signal to noise ratio (SNR) indicates a cleaner and better quality image.
JPEG images from the Canon PowerShot SX40 HS show good signal to noise performance across the sensitivity range with results beating those from the Sony Cyber-shot HX100V, Panasonic Lumix DMC-FZ48 and Canon PowerShot SX30 IS.
For a full explanation of what our resolution charts mean, and how to read them please click here to read the full article.
This chart indicates that the Canon PowerShot SX40 HS's JPEGs are an improvement over the Canon PowerShot SX30 IS and just take the lead over the Sony Cyber-shot HX100V from a sensitivity of ISO 800. This shows that the Canon PowerShot SX40 is capible of capturing a more shadow and highlight detail in low light conditions than the Sony HX100V, Panasonic Lumix DMC-FZ48 and Canon PowerShot SX30 IS.
For more more details on how to interpret our test data, check out our full explanation of our noise and dynamic range tests.