Re: Rel vs Abs proofs
Re: Rel vs Abs proofs
- Subject: Re: Rel vs Abs proofs
- From: Rick Gordon <email@hidden>
- Date: Thu, 12 Oct 2006 19:27:11 -0700
On 10/12/06 at 2:11 PM -0700, Marco Ugolini wrote in a message entitled
"Re: Rel vs Abs proofs":
>A few brief observations regarding this discussion (which seems to be getting more and more convoluted and confusing as it moves along):
>
>1) The whole purpose of the Absolute Colorimetric rendering intent is to simulate the effect created by the substrate on which an image will be printed (on a printing press), effect which will determine both the white point (obviously) and other colors throughout the image (to varying degrees). And, of course, in order to do this, the paper on which the proof is done has to have an L* value equal or higher than the final stock. So, pray tell, how is it supposed to make our proof any better, or more dependable, if we print it without simulating the white point of the final stock?
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Well, I work primarily in the book industry, where there is plenty of paper white to be seen, and find that the dots in white areas can be quite clearly visible.
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>2) One other thing is also not clear to me: are we assuming that when we produce the proof we are *trimming* its edges, so that the whitest point in the proof is the *simulated* white of the proof and not the white *of the paper itself* visible in those edge areas that are not covered by any ink? If you trim your proofs, the eye adapts fairly quickly to the proof's simulated white point, and the average client will probably never make an issue of it unless *you* are foolish enough to point it out to him/her.
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Obviously, trimming helps, but it's still visible, and often the prospect of trimming upwards of 250 proof sheets is decidedly unappealing.
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>3) Call me not the brightest bulb in the room if you please, but isn't "a hybrid colorimetric rendering that is essentially AbsCol except for pure whites" what we already call Relative Colorimetric? And if by "hybrid" you mean an intent that simulates the effect of the substrate on the whole image except pure whites, why would you provide your client with a proof exhibiting a degree of contrast that is higher than what can be matched on press?
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According to my reckoning, the question is basically one of mitigating the variance between AbsCol and RelCol in the light values, while not winding up with an overly strong shift in luminance between the pure whites and the nearly white values.
I would say that, since a number of experienced prepress folks on this list have issues with some of the aspects of AbsCol rendering, that it is not an open-and-shut case that AbsCol is the only viable alternative.
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___________________________________________________
RICK GORDON
EMERALD VALLEY GRAPHICS AND CONSULTING
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WWW: http://www.shelterpub.com
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