Statistics for treating HPZ data as XRDI, XRGA, and GMDI then converting as required to current XRGA X-Rite standard.
This data compares the first printed iSiS compatible target sheet read with an iSiS 2 XL with its corresponding data from the HPZ spectrophotometer.
XRDI - Delta E2000: Ave: 0.94, Max: 2.17, Median: 0.91, Worst 10%: 1.38
XRGA - Delta E2000: Ave: 0.79, Max: 1.82, Median: 0.75, Worst 10%: 1.12
GMDI - Delta E2000: Ave: 0.62, Max: 1.67, Median: 0.58, Worst 10%: 0.95
This is a comparison of the two, identically printed sheets read with the same iSiS 2 XL.
Sheet 1v2 - Delta E2000: Ave: 0.46, Max: 1.08, Median: 0.44, Worst 10%: 0.74
It's pretty clear the HPZ spectrophotometer is based on the older GretagMacBeth tech, as Ernst had predicted, and that should be the selected conversion mode.