As part of our image quality testing for the Canon IXUS 500 HS we've shot our resolution chart.
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 IXUS 500 is capable of resolving up to around 18 (line widths per picture height x100) in its highest quality JPEG files.
See a full explanation of what our resolution charts mean, and how to read them please click here.
Examining images of the chart taken at each sensitivity setting reveals the following resolution scores in line widths per picture height x100:
ISO 100, score: 18 (see full image)
ISO 200, score: 18 (see full image)
ISO 400, score: 16 (see full image)
ISO 800, score: 16 (see full image)
ISO 1600, score: 14 (see full image)
ISO 3200, score: 12 (see full image)