Re: Real world isis ver i1 iO test
Re: Real world isis ver i1 iO test
- Subject: Re: Real world isis ver i1 iO test
- From: Graeme Gill <email@hidden>
- Date: Fri, 05 Mar 2010 12:00:46 +1100
Martin Weberg wrote:
Now over to the difficulties in interpreting these results.
It is unclear what introduces the iO's higher differences. Is it due
to less measurement accuracy or due to possible different paths while
reading catching test chart non-uniformity? Let's assume the latter,
that the iO takes two slightly different paths and the iSis takes the
exact same paths. Then, accuracy could be the same for both
instruments and still give results like above. The two different iO
readings would be valid representations of the test chart.
My guesses as to why the i1pro would have lower consistency are:
Lamp effects. The lamp in the i1pro has noticeable time
dependencies. I suspect they get worse with age.
Patch edge affects. With a mechanical scan that is
indexed rather than using patch recognition, there is
likely to be a cleaner distinction and more consistency
between the patch area that gets scanned. With patch
recognition a reading that includes some influence
of the patch edge can be included in the readings.
and as you note, there may be more path variation for
the i1pro.
Doing individual readings with constant timing between
them seems to get better repeatability out of the i1pro.
Graeme Gill.
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