A hypothetical question about unresolved color shifts?

Started Mar 4, 2013 | Discussions thread
Petruska
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Re: A hypothetical question about unresolved color shifts?
In reply to rpenmanparker, Mar 5, 2013

rpenmanparker wrote:

Petruska wrote:

rpenmanparker wrote:

Bear with me please for a thought experiment. Supposing every color of the ink you were purchasing were shifted slightly toward one color or another, let's just say red for simplicity? Isn't it true that using a custom profile made specifically for this set of inks could never balance the colors. No matter how they were mixed, the red shift would always be present? Even if not every ink color were shifted toward red, but only a significant fraction of the colors, couldn't the same thing happen. If the cause were an impurity or contaminant and only the colors you would use to balance the shift contained it, no combination of them would ever set things right.

Don't ask what I am getting at here, I am not quite sure myself. Maybe I am just wondering whether some of the never quite resolved shifts could be explained this way. Someone (?, memory is not that good) recently posted spectra for inks that showed one brand had a significant peak for an "opposite" color along with the main component, like a cyan peak in a magenta ink or vice-versa. Wouldn't that do what I am suggesting, make it impossible to resolve a color shift with profiling, because the ink you would favor to cancel the shift would just make it worse.

As I am now essentially fully converted to Image Specialists inks in my Canon PP9000 Mk II, I notice a very slight warm tone that custom profiling will not fix. Just wondering...

Robert

The frist thing all the lurkers around here are going to ask is what light source are you viewing under?

Most profiles are made to viewed under daylgiht.

Bob P.

Sure, good point. I am seeing some dofferences from test inages I printed several months ago. But like I said, no real conviction here. I was just thinking and this alternative explanation popped into my head. Not so much about my own experience as a generic idea.

Robert

Ah, slight shifting of colors from prints made months ago compared to new prints?

Yes, that will happen as the ink ages on the prints.  If you measure the same color printed blocks once a month for a year you will see the changes.

That's why we usually preach around here that it's a good idea to let ICC profile target prints dry at least 24 hours before scanning.  Thus the suggestions on how to do that with the ColorMunki system which has an issue with delaying the scanning process.  It's a great idea to let those target prints dry for days before scanning to minimize color shift months down the road.....

Bob P.

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