Re: Delta readings for print target profiles
Re: Delta readings for print target profiles
- Subject: Re: Delta readings for print target profiles
- From: Roger Breton <email@hidden>
- Date: Mon, 25 Apr 2005 22:23:45 -0400
> Can someone breifly explain the terms below in reguards
> to how they might influence the creation of a profile,
A profile should ideally return Delta Es as close to zero as possible. But
this is not something under your direct control, until you decide to roll up
your sleeves and dive into profile editing.
> and
> what they may mean in reguards to the accuracy with which
> the target was read.
Determining how accurately a target was read is not a sinecure. Your best
bet is to read the same target over a number of times and analyse the
deviations. That's how I like to do it -- when I have the time. But there is
no direct way of assessing this. Not that I know of: you can't feed a target
into an instrument and out comes a report saying how accurately was the
target read. If you want to reassure yourself of the quality of your
measurements there are all kinds of tests you can do from comparing readings
across instruments, to using some kind of calibrated references (they ain't
cheap), etc. But, IMO, the best assurance is to send your instrument off to
have it recertified periodically. It will cost you but it will save on
Tylenol in the long haul.
> Alos, are there certain "limits" or numbers
> I would want to ideally achieve?
As stated above, as close to zero as possible. Now we all know that's not
always possible :O)
So it depends. I'll throw my two cents, here. It'll get everyone going.
> 1) Average Delta E
3 to 6.
> 2) Average Delta E 94
2 to 4
> 3) Average Delta E CMC
That last one should be determined by a committee of "experts" based on a
number of "accepted" samples. That's what I was shown at the MCSL. Typical
values are 2 to 4. The same as dE94.
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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