Re: Silly question department, Display Media White Point
Re: Silly question department, Display Media White Point
- Subject: Re: Silly question department, Display Media White Point
- From: Mark Stegman <email@hidden>
- Date: Sat, 28 Feb 2015 11:49:17 +1100
Don,
I find one of the enduring impressions is that standards are based on 'ideal' conditions. They are based on an average and try to reflect what a printer might be reasonably expected to achieve in the real world. There is still some debate on what that average should be but I just wanted to make the point that his is why the specifications have tolerances. It is also why the tolerances for proofing are tighter than are for printing.
As for the 'problem' of Adobe default Color Settings ( if that's what you were referring to) I personally don't understand it. If anyone in this industry doesn't know how to customise their Color Settings or, better still, access and install those provided by a multitude of global publishing industry organisations along with all the helpful information that goes with it they should be washing windows.
Regards,
Mark Stegman
> On 28 Feb 2015, at 3:31 am, Don Hutcheson <email@hidden> wrote:
>
> Roger,
>
> The main reasons CGATS.21 (ISO15339) does not include a new version of TR005 between CRPC4 and CRPC5, are (1.) most North American magazine stocks have moved to a lower b* and (2.) substrate-correction (SCCA) lets you adapt the nearest CRPC to your particular stock.
>
> The real problem is that paper changes faster than standards can. It’s impractical for industry associations like IDEAlliance or FOGRA to invest in the expensive, laborious, time-consuming business of multiple press runs, data smoothing, peer review, etc., just to make a new "standardized data set" for every new paper type. Thats why the concept of substrate-corrected colorimetric aims (SCCA) is so valuable.
>
> If you are still using the original TR005 paper, you can still use TR005 as your target space. If your paper is not exactly the same color as TR005, you can tweak either TR005 or CRPC5 to your actual stock color with the SCCA method.
>
> Obviously, the fact that every press prints slightly differently on any particular stock makes the idea of a “perfect” CRPC a little unrealistic, and the same is true of SCCA. The potential difference between a CRPC (with or without SCCA) and individual press characterization data depends (amongst other things) on paper absorbency, ink color, ink hold-out, etc. Obviously, no industry-standard characterized reference print condition is ever going to “exactly match” the performance of every press, and vice-versa. But remember that even if you make your own press profile, the resulting proofs will still seem to vary in “accuracy" from run to run. It’s the nature of offset.
>
> A major problem today is that the accuracy and consistency of ink jet proofing has led many people (both print buyers and printers) to expect more accuracy and consistency from high-volume commercial printing than the limitations of offset can deliver. Ink jet proofing can be incredibly accurate and consistent, but no matter how accurately a proof matches a particular CRPC, or even a custom press profile, nothing guarantees you’ll get the same exact color on any particular press run.
>
> A proof is, at best, just a close approximation of a final printed sheet. Anyone who doesn’t realize that has lost touch with the reality of printing as a manufacturing process.
>
> Having said that, if you feel strongly enough that a new version of TR005 is required in CGATS.21, please say so at the next IDEAlliance Print Properties and Colorimetric Council meeting. Feedback like that is exactly why the committee exists.
>
> As for GRACoL being "my baby”, thanks for the credit but I only cracked the whip. Others much smarter than I did the real work.
>
> I presume you’re being sarcastic about Adobe!
>
> :-)
>
> ........................................................
> Don Hutcheson, President
> HutchColor, LLC
> Washington, NJ USA
> email@hidden
> M: 908-500-0341
> ........................................................
>
>
>
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