Re: MonacoProfiler Help
Re: MonacoProfiler Help
- Subject: Re: MonacoProfiler Help
- From: Marc Levine <email@hidden>
- Date: Fri, 20 Jan 2006 16:31:08 -0500
- Thread-topic: MonacoProfiler Help
Title: Re: 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 “0”. 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 “worse” 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 “bad seed”.
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 (that’s 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 “lucky” and will deal with some things better than others. Even on an truly uniform, optimized output device, the profile’s 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 “fallen”, it is often symptomatic of something else.
By no means am I saying that it is never the profile’s 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 “fail” in a certain area where another’s 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 “shape” 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
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