Re: MonacoProfiler Help
Re: MonacoProfiler Help
- Subject: Re: MonacoProfiler Help
- From: Marc Levine <email@hidden>
- Date: Sat, 21 Jan 2006 11:55:42 -0500
- Thread-topic: MonacoProfiler Help
Hello Jim and other color earthlings,
I just thought I would chime in here for a little clarity about what you are
seeing. First things first: the deltaE. At the end of every profile build,
MonacoPROFILER gives you 3 average dE values one each for dE-Lab, dE 94,
and dE CMC. So what do these number really tell you? And, how do we get
them? After all, a deltaE is a difference in 2 colors and all you did was
measure one set of colors when you built the profile, right?
What this number (these numbers) tell you is, if you take the measured data,
run it through the inverse side of the profile, and then take the resulting
device data back to Lab through the forward table, what is the difference.
(often called a roundtrip). Where did you start and where did you end up. In
an ideal world, this number is ³0². However, this is not an ideal world, and
the profile has to overcome the differences between an idealized set of
device data and the real data that is measured off of your ICC target. The
³worse² your printer behaves, the tougher it is for the profiling engine to
build a profile that fits color to you device accurately.
So...this number is a signal. If the number is higher than normal (2 and
higher is big for dE-lab), then you could have a couple of problems. Maybe
you measured something wrong or maybe the data is just that irregular. It
sounds as if in this case that the latter may be the case. Also, the
fact that you are seeing quality issues appear or disappear with increase or
decrease of black, indicats that maybe the black in particular may be the
³bad seed².
It should also be noted that just because your dE values are low, it does
not mean that you have a great profile. What it does mean is that the
software thinks you have a great profile. Again, even if the profile fits
the data to its models well, you may still not get exactly what you want if
the data on which you have built everything is not accurate (that¹s why you
need an accurate spectro).
Think about it this way. When you build a profile, the
configuration/behavior of the device has a huge impact on the profile
quality. Profiles can get ³lucky² and will deal with some things better than
others. Even on an truly uniform, optimized output device, the profile¹s
mission is still a tall order having to fit the realm of visual color
definition into the gamut of your device in a way that is both pleasing and
color accurate. In cases where it would seem that the profile has ³fallen²,
it is often symptomatic of something else.
By no means am I saying that it is never the profile¹s fault. In fact,
different profiles, built with the same data, from different manufacturers
will typically exhibit some differences which is a big factor in
understanding what quality means. In some cases, different profiles will
show different flaws. In some cases, one manufacturers profiles may ³fail²
in a certain area where another¹s does not.
But I digress. Long story short.....your dE is pretty high after the profile
build, and this is telling you that something is amiss. Chances are that
if you ³shape² your device a little better, the improved data set will make
a big difference is the quality you see from any software package, including
your copy of MonacoPROFILER.
Hope this helps,
Marc
--
Marc Levine
Sales/Technical/Marketing...guy.
X-Rite Incorporated
Email email@hidden
www.xrite.com
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden