To test the Canon EOS 600D image quality, we shot our resolution chart with a Sigma 50mm f/1.4 EX DG HSM lens.

If you view our crops of the resolution chart's central section at 100% (or Actual Pixels) you will see that, for example, at ISO 100 the Canon 600D is capable of resolving up to nearly 24 (line widths per picture height x100) in its highest quality JPEG files.

Examining images of the chart taken at each sensitivity setting reveals the following resolution scores in line widths per picture height x100:

Canon eos 600d: resolution iso 100
Canon eos 600d: resolution iso 100

JPEGs

Canon eos 600d: resolution iso 100
Canon eos 600d: resolution iso 100
ISO 100 (Click to view full size image)

Canon eos 600d review
Canon eos 600d review - iso 200

ISO 200 (Click to view full size image)

Canon eos 600d review
Canon eos 600d review - iso 400
ISO 400 (Click to view full size image)

Canon eos 600d: resolution iso 800
Canon eos 600d: resolution iso 800

ISO 800 (Click to view full size image)

Canon eos 600d: resolution iso 1600
Canon eos 600d: resolution iso 1600

ISO 1600 (Click to view full size image)

Canon eos 600d: resolution iso 3200
Canon eos 600d: resolution iso 3200

ISO 3200 (Click to view full size image)

Canon eos 600d: resolution iso 6400
Canon eos 600d: resolution iso 6400

ISO 6400 (Click to view full size image)