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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.
Here we compare the Sony HX400 with the Canon PowerShot SX50 HS, Fuji HS50 EXR and Panasonic FZ72.
JPEG signal to noise ratio
In terms of signal to noise ratio, the HX400 again puts in a good consistent performance, especially at low to mid-range sensitivities. It is the Canon PowerShot SX50 again which beats the HX400 at almost every sensitivity, dipping just below it at the very top end of the sensitivity run.
JPEG dynamic range
Here we can see that the HX400 puts in a very consistent performance throughout the sensitivity range, but it's not a match for the Canon PowerShot SX50, which scores better than it at every sensitivity. It is also beaten by the Panasonic FZ72 throughout most of the range. The Fuji HS50 puts in a worse performance, but that could be a reflection of Fuji's tendency towards warmer tones.
Amy has been writing about cameras, photography and associated tech since 2009. Amy was once part of the photography testing team for Future Publishing working across TechRadar, Digital Camera, PhotoPlus, N Photo and Photography Week. For her photography, she has won awards and has been exhibited. She often partakes in unusual projects - including one intense year where she used a different camera every single day. Amy is currently the Features Editor at Amateur Photographer magazine, and in her increasingly little spare time works across a number of high-profile publications including Wired, Stuff, Digital Camera World, Expert Reviews, and just a little off-tangent, PetsRadar.