"The problems users had with the old chart:
- It is defined as a high contrast test chart with a white background. This sometimes causes clipping in the highlights or/and the shadows.
- Visual analysis is often impossible
- The high contrast edge is subject to sharpening which leads to misleading results when looking at an SFR derived from the edge"
The new chart is sine Siemens star image considered to be better suited for the resolution measurements, although system sharpening can still present a measurement challenge.