Re: 40-42 inch HD flat screen with accurate color
Re: 40-42 inch HD flat screen with accurate color
- Subject: Re: 40-42 inch HD flat screen with accurate color
- From: Peter Karp <email@hidden>
- Date: Mon, 8 Nov 2010 21:00:41 +0100
Hi Richard, Roger and all monitor friends :-)
> Either Fogra's test unit was vastly different from yours -- could
> have been super hand-picked by NEC, you could say -- or their
> rigorous test methodology failed to bring out the defect that you
> consistently ran into. One of the two. It's going to be interesting
> to read Peter's response, if he can comment.
I don't follow the list on a daily basis, so excuse the
lag :-)
The question if a monitor tested by Fogra is "tpyical" for the
production series is explained on the homepage under "PreCert Info".
The short answer is: yes and no. ;-)
Please read the details here:
http://fogracert.fogra.org/index.php?menuid=138
I have seen that it is helpful to translate the documentation for the
Fogra test pictures to english. I'll upload the english docs soon and
will post a short announcement here.
When we test a monitor we don't know if it was "super hand-picked",
but from our experience the tested monitors (which mostly use some
sort of uniformity correction) are in the typical range of the
production series in regards to uniformity. Also the feedback we get
from our members (manufacturers and users) backs up that experience.
So my guess why Richard was not happy with the uniformity of the
monitors he tested is
a) they where not uniform (regarding FograCert criteria) -- could be,
but not likely
b) Richards needs are very high and the monitors might have met the
criteria of FograCert Softproofing System, the uniformity might still
not be "good enough" for his wishes
It is important to be aware how criteria and tolerances for testing
_every_ system have to be choosen.
First criteria have to be found which allow a good correlation between
the visual experience and the analysis of the measurements. Second a
good compromise for setting the tolerances has to be made. In general
the end user always wants very tight tolerances while manufacturers
would like big tolerances of course. So a good balance between the
wishes and needs of a high-end user and also the technical
realizability a manufacturer can achieve in production series has to
be found.
For the softproof research project we had great support from the
industry as well as users. Both gave valuable input in the concerted
meetings we had. Together we defined two criteria for the uniformity
(details see on the homepage) which in our experience show a really
good correlation between the visual experience and the objective
appraisal. In the meetings we agreed that the choosen tolerances
assure a good quality in uniformity for high-quality users _and_ are
achievable. Although this does not mean that you are assured that you
can see _no_ small colour deviation over the screen area if the
tolerances are _just_ met. Then for very critical work a user might
still wish a better uniformity. To achieve this the test pictures are
really helpful. Maybe in the future also the monitor calibration
packages might offer an option to test the uniformity according the
PreCert criteria? Also a user might establish his own tolerances --
but of course this will decrease the number of options to choose from
and sometimes a wish or better said need might not be fulfilled to the
full extent. But for monitors there are quite some really interesting
products available. Especially when you think back some years and
remember how a CRT looked (only exception is viewing angle). ;-)
I hope this answer helps to understand the usefulness of the monitor
PreCert as part of the FograCert Softproofing System Certification and
can also be of some help when choosing a monitor to match your needs.
:-)
Best regards
Peter
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