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Re: Accuracy of instruments

Mike Strickler wrote:

there is inevitably a point at which increasing an instrument's accuracy becomes statistically meaningless. (To give a crude example, you don't need a micrometer to frame a house.) Perhaps this can be approached empirically: Can anyone demonstrate a noticeable and objectionable variability in printed color that can be traced to the performance of any recent model of spectrophotometer that has passed its manufacturer's certification process?

Of course one can: Take two new spectros (different models), create two profiles for the same printer and compare the results. In all probability an expert eye will notice /considerable/ differences between the results at first go. Repeat the procedure with one of the spectros. In all probability no one will notice differences between the two profiles measured with the same instrument. That's what Terry was talking about: Repeatability is not the Problem, but inter-instrument agreement is. An I guess it's playing in the same order of magnitude than inter-observer differences.

The example conforms with the results of several inter-instrument-agreement-tests, e.g. performed by the University of Wuppertal/Germany.

Their conclusion: inter-instrument differences are a significant Factor in colormanagement-based process control, see e.g. <http://www.digitalproof-forum.de/rueckblick/ergebnisse04.php> (German).

Klaus
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