The i1 should measure about 100 patches per second in scan mode. So, keep that in mind when scanning. Not too slow, certainly not too fast.

To give you an idea of another instrument, here's a 800 patch target run through my iSis three times and reported from ColorThink:

Here's a report of the iStar run through the iSis three times:

dE Report

Number of Samples: 832

Delta-E Formula dE2000

Overall - (832 colors)

--------------------------------------------------

Average dE: 0.05

Max dE: 0.33

Min dE: 0.00

StdDev dE: 0.03

Best 90% - (748 colors)

--------------------------------------------------

Average dE: 0.04

Max dE: 0.09

Min dE: 0.00

StdDev dE: 0.02

Worst 10% - (84 colors)

--------------------------------------------------

Average dE: 0.12

Max dE: 0.33

Min dE: 0.09

StdDev dE: 0.04

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Thanks Andrew. I'm now a proud owner of a copy of Color Think Pro and have even reported my first bug. I get the following from two scans of the Atkinson 1728 target. I did three but one gives me a delta over 1 so I have used the closest 2.

dE Report

Number of Samples: 1728

Delta-E Formula dE94

Overall - (1728 colors)

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Average dE: 0.11

Max dE: 0.68

Min dE: 0.00

StdDev dE: 0.06

Best 90% - (1554 colors)

--------------------------------------------------

Average dE: 0.10

Max dE: 0.18

Min dE: 0.00

StdDev dE: 0.04

Worst 10% - (174 colors)

--------------------------------------------------

Average dE: 0.24

Max dE: 0.68

Min dE: 0.18

StdDev dE: 0.07

--------------------------------------------------

My numbers appear to be about twice yours. Any idea whether I need more practice, or if this is what I should expect? What I have noticed is that the first 2 rows are the hardest to scan. Both take a lot of goes while most others are easy.