Re: Spectral Response and Colorimeters....
Re: Spectral Response and Colorimeters....
- Subject: Re: Spectral Response and Colorimeters....
- From: "tlianza" <email@hidden>
- Date: Sun, 3 Feb 2002 16:36:35 -0500
Thank you Bruce,
That target image you designed is a real treasure and more people on this
group should make use of it....It's a great visual target AND it has a copy
of W&S in the correct color. You have got to be a color scientist...maybe
you should add Hunt's book, The Reproduction of Color on the next go
around....it's got a nicer cover.. Whenever I have a printing problem, I
just send that target to the printer to make sure that the monitor-printer
loop is working well. I wish more people would try understanding just how
simple that is to check.
What's interesting about ColorSync is that it puts some real pressure on all
of us developers to come up with processes, workflows and algorithms that
work. What's interesting about this group is the range of users and
experienced people that have no hesitation about stating their own opinions.
Since I've started reading the group, some of my work direction has changed,
particularly in the area of adaptation and hardcopy comparison. It
interesting to see all the conflicting comments from very experienced
people. What people of all ranges of experience are seeing is that the base
science and the base instrumentation (especially in reflection measurement)
is probably on the fringe of acceptablity for the task.
On the other hand, I have found that there is a lot of sloppy work in the
field as well. It makes no sense to profile a device that does not have an
associated solid quality assurance test. At the start of this whole mess, I
was very vocal about including a set of densitometric readings of known
patches in the profile. My point was that these patches could be monitored
using simple densitometric devices and we would then be assured that the
profile we are using would be based upon known device parameters. If the
simple measurements were off, we would know that the profile was no longer
accurate. That sort of fell on deaf ears and now the average user has no
standard mechanism to test the device to see if it has drifted relative to
the profile....For some, it made more sense to go through the whole profile
generation process another time, but we then we still have the constant
uncertainty of machine performance vs. profile accuracy. In my opinion, the
Color Mangement Providers have not provide the necessary quality assurance
tools to allow the customer to use the process with any objective degree of
certainty. That's a roadblock to success that should be addressed.
Tom Lianza
Technical Director
Sequel Imaging Inc.
25 Nashua Rd.
Londonderry, NH 03053
email@hidden
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