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DeltaE madness
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DeltaE madness


  • Subject: DeltaE madness
  • From: MSP Graphics <email@hidden>
  • Date: Mon, 15 Oct 2007 13:32:16 -0700


I'm no delta E worshipper but I sometimes cringe at blanket dE numbers such as "< 2 dE not distinguishable". I can tell you for a fact that .75-1.0 dE on a midtone gray patch is certainly visible while 2-3 dE on primaries/secondaries is difficult to see. In other words, it depends.

That's right, and I've never made such a statement. Yet we have people here making judgments/claims based on something like .3 average DeltaE(76) between the RIPs! It's ludicrous. Further, it's one thing comparing patches and another comparing actual images, where the erroneous color may or may not be conspicuous or even present. Why don't we talk a bit more about which sorts of errors are the MOST frequent source of trouble, like gray balance?

As far as all RIPs getting decent dE numbers and an excellent visual match, 'tis true, but the distinguishing feature among the higher-end RIPs is the ability to MAINTAIN that level of accuracy. There's only a couple of RIPs that I consider to have the right technology to maintain those kind of dE numbers over time (needing to re-profile the entire system doesn't count in my book).

Let's clarify the waters a bit. The drift in the system is always the printer, ink, and paper, not the RIP per se. However well or poorly the color holds up over time is purely a printing function. So then it's a question of how easily and well the RIP allows one to correct for that. Assuming no huge system change (like swapping in a different brand of ink or paper) the RIP can realign the color either by a simple relinearization of each color ramp or, better, reading a large sampling of solid, tints, and overprints. You're right, not all RIPs do the latter, and it is really superior, especially if it's iterative. And to be clear, the proofing RIP I sell does this, and my statements about accuracy should be placed in that context. But let's be honest, this process takes a bit of time--the price we pay for accuracy. The sort of "free lunch" option is one of these RIPs with an HP Z-Series printer, and either auto-schedule the process for down time or manually start it before lunch or shift's end.


Good discussion!

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