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
At the lower sensitivity settings the Canon Rebel T5i has a slightly lower signal to noise ratio (SNR) than the Rebel T4i it replaces indicating that it produces JPEGs with a little more noise. This is probably to reveal a little more detail. Beyond ISO 1600 the Rebel T5i's SNR is a very close match for the Rebel T4i's and both are beaten by the Nikon D3200, Nikon D5200 and Sony Alpha 58.
Raw signal to noise ratio
As with the JPEG files, after conversion to TIFF the raw files from the Canon Rebel T5i have a lower SNR than the Rebel T4i's files up to around ISO 3200. With the exception of the lower sensitivity settings, the Rebel T5i beats the Sony Alpha 58, but it a fairly close match for the Nikon D3200 and Nikon D5200.
JPEG dynamic range
While it doesn't match the Sony Alpha 58, Nikon D5200 or Nikon D3200 for JPEG dynamic range it seems likely that Canon has done this deliberately to produce higher contrast images that look print-ready.
Raw dynamic range
The Rebel T5i's raw file (after conversion to TIFF) dynamic range is a very close match for the Rebel T4i's - hardly surprising given that they have the same sensor and processing engine. The highest dynamic range is achieved at ISO 200 and ISO 400 (from where it more-or-less matches those of the Nikon D3200 and Sony Alpha 58). The Nikon D5200's raw files (after conversion to TIFF) have the widest dynamic range at any sensitivity setting indicating that it can capture the widest range of tones ina single shot.