Re: i1 Scanning Table
Re: i1 Scanning Table
- Subject: Re: i1 Scanning Table
- From: Graeme Gill <email@hidden>
- Date: Tue, 02 Mar 2010 18:07:24 +1100
Terence Wyse wrote:
I would say the .4 dE consistency range for the iO is being kind....I've seen much
greater than that. And .2 dE for the iSis is perhaps being a bit UNkind...I typically
see sub-.10 dEs when remeasuring a chart.
Is that in strip read mode or patch mode for the i1pro ?
If it's strip mode, then things like lamp turn on to
first patch reading time and patch recognition algorithms are
probably having and influence, as does the speed with which it
is used.(I think the X-Rite drivers start reading a bit too soon
after lamp turn on myself, perhaps affecting the first patch
accuracy).
The instrument itself can be remarkably consistent. In some
tests I've been doing I get consistency errors of about 0.05 delta E
if the instrument is not re-positioned, and the readings are
performed at consistent timing intervals (hinting that lamp
cool down timing has some influence over consistency). There's
no doubt that an LED (as long as it has temperature compensation)
is a better light source as far as consistency goes. It has other
disadvantages though, such as a poor spectral shape and no UV component
(you need some sort of extra LED for UV included, and it probably
won't match a standard spectrum like D50 perfectly in regard to FWA/OBE
response).
Graeme Gill.
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