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There are some closed loop color control systems for web presses that take an RGB image of the actual job, on chosen areas, and make adjustments thereafter. KBA's press consoles for sheetfed, Densitronic, also allows to select areas of the print areas of the job to take spectral or density...

The output preview has an output profile setting, by which it simulates the image. What that profile setting was? Different than the UCR profile? If so, your image might be indeed as you wanted, but the output preview, governed by the above-mentioned setting, would be different. I think that...

Thank you all, These certainly are ideas worth considering. Just as an update, I'm looking more in the hard truth of the presses getting old, and possibly having backlash of the gear train... or the anilox roll not wetting enough... I do not know what would be more expensive to fix, if we were...

Hi all, There is no section for flexography, and even if the issue i'm dealing with is not directly related to color management, I'd post it here seeking either some ideas on how to deal with the problem, or a suggestion for another forum to ask a question. The application is wide format...

Just look at b*: You got 9.00 Deltab* between the two stocks that forces a 4.0 Deltab* on the printed color. It's pretty hard to imagine that there is anything else than the stock! -D

A bit of both. You do answer that it is possible, so I had to leave the room open for such a reply. I've seen a 2007 TAGA study (Spatial Uniformity of Offset Printing by Franz Sigg) done on a 74 speedmaster coming up with 0.08 density variation across the sheet as being normal. I've also seen...

Density is not ideal for measuring spot colors. Density focuses on the peak wavelenghts of the cyan, magenta, and yellow process colors. A special color has a different peak wavelength, that a densitometer fails to capture. Sometimes the secondary density, which for the case of 283 would be that...

"Only way seems to be varnishing the 4 color sections." Have you tried decreasing the TAC as well? It could be an easy fix if whatever happens happens only on the rich blacks, or it could at least help together with the other suggestions made in this post.

I would think that most ink companies would offer something of the sort if they want to be in business these days. T., what does 'stay open' mean?

I do not think that this discussion is about color management, rather press engineering. Color management is very useful in a lot of forms, and will always envolve (so I could have a job). What needs to be looked at is the mechanical/chemical part of the press design so that color management can...

I do not know much about printing on plastics, but apart from the lamps, you got to make sure that you maintain your reflectors clean. These are actually more important, since most of the UV light comes from them to the ink/substrate. You could use the RadTech or Tape-Reader devide to make...

I guess there is none. Using 'common sense' I thought that they wouldn't differ from application to application. Do the third parties create their own LAB libraries or does PANTONE provide each one with different values would be one question. The second, you would expect that when talking for...

Not a chemist or ink expert, but working with UV and hybrid presses. If your customers ask you for lower or no VOCs, then UV inks do that. However, they are most likely to have higher energy costs due to the UV lamps. Do you need to convert the prints in any manner? The fact that they come out...

A nice place to start reading is: ICC White Papers

published LAB values? published LAB values? I guess 'publish' is not a right way to put it, and you also got me questioning myself. However, if you setup photoshop in LAB mode and pick a color from the pantone library, then it would provide you with an LAB value. I was not sure if that LAB...

The mix used in the recycled board is varying and the coating of the surface might vary as well, depending on the machine used on the recycled paper mill. That said, it doesn't really matter if the name is the same; the stock could vary in its physical properties causing runnability problems...

some variation is to be expected... even in the stock they are using. They are after all printers. But 12 deltaE is too much. But to their defense: they do publish the LABs of their swatches on their digital libraries.... isn't that something?

Is a 'trick' question? :) your X-rite should be able to hit the values of the LABref. These cards come with fairly good instructions on their use as well. labref color - Google Search and this presentation explains instrument variability very well too...

In packaging I would expect it to be the norm. Else, what? Too risky! Relying on subjective measurement without any documentation can be disastrous. I know ink suppliers when formulating a spot color ink, they measure the DE of a drawdown, check whether it is light or not, or whether there is...

There is no spec though for spot colors... only two questions: what is achievable by the press, and what is acceptable by the customer. You got to strike a balance there. We've found that a DEcmc(2:1) of 2.00 overall and 1.50 for pastel colors , measured at D50/10 satisfy most of our customers...