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Re: How to get great prints- was Re: Shiraz rip

Title: Re: How to get great prints- was Re: Shiraz rip
In a message dated Mon, 29 Aug 2005 17:23:06, Roger Breton wrote:

Even the 4000 is not THAT repeatable. I won't bore the list with details of this un-repeatability but on certain color patches I'm getting in excess of 7 deltaE from one print to another. And the 4000 printer in question is only a few months old.

Roger, I do greatly respect your opinion, but can anyone else confirm this too?

Incidentally, which Delta E method is being used is important too: at RIT's Munsell Color Science Lab, they strongly recommend the use of Delta E 2000 and tend to dismiss the usefulness of older versions of Delta E. Also, no matter how it's calculated, let's keep in mind that even a discrepancy as large as 7 Delta E is more dramatically noticeable in certain colors and less so in others. So, depending on which colors we are considering, some color differences are relatively less relevant than others for practical purposes. As good as they are, by and large spectrophotometers still do not function the way the human eye does, with its all-too important psychophysical aspects. Typically, for reasons of eye physiology, differences in the green range of the visible spectrum are more readily noticeable to the average viewer than those in the yellow-red or blue-purple areas, with accuracy of perception falling sharply as one approaches both infrared and ultraviolet ends. So it's important to carefully consider in which colors these discrepancies occur, and whether these color differences are as visible and relevant to the average viewer as they are to the spectrophotometer.

In conclusion, as Elmer Fudd once wisely opined, let's be vewy vewy careful...

--------------
Marco Ugolini
Mill Valley, CA 
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 >Re: How to get great prints- was Re: Shiraz rip (From: Roger Breton <email@hidden>)



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