Re: Subject: Re: Color Bars on Inkjet Proofs
Re: Subject: Re: Color Bars on Inkjet Proofs
- Subject: Re: Subject: Re: Color Bars on Inkjet Proofs
- From: Roger Breton <email@hidden>
- Date: Thu, 08 Nov 2007 07:23:47 -0500
Hi Richard,
> does it mean there is inkjet colorimetric data that is related to these
> standards for the multitude of inkjet and substrate combinations.
No, that's not how it works. I would not want to repeat Terry's excellent
comments but the data is not coming from the printer itself, no, as that
would not serve a useful purpose.
> To put it
> another way, is there GRACoL_x conforming data for the Epson 4800 or say the
> Canon IPF5000 on, let's say, an EFI proofing paper that could be pulled from
> the patches on a control strip that would confirm compliance with the
> GRACoL_x standard for that particular printing device?
No. And yes. Depends. You see, if you order a SWOP2006-certified proof from
IDEAlliance they will sell you an inkjet proof that conforms the
colorimetric data of SWOP2006. We know such proofs are ran on certain
devices and media. So you could say that the control bars used on this
particular flavor of SWOP2006-certified proof is made "specifically" for
such and such printer and media. But that's even pulling hair.
> Yes I know the RIP
> manufacturers have been selling the SWOP branded Seal of Approval for
> awhile. But if you're a printer and you get a proof from your publisher or
> ad agency client with this SWOP or Gracol branded combination of device, ink
> and paper, can you actually tell it is what it says it is from reading
> patches?
Alas no. It's not possible to tell what particular inkjet CMYK 'device'
values were used on that particular proof. The only way that such analysis
could prove fruitful is to know what the CMYK build of that color bar is and
know what its expected colorimetric data is for a given printing scenario
and then take measurements and compare or just plain compare visually with
something you have on hand, easier yet. The business about measuring is to
be taken with a grain of salt as FWA in the proof substrate *will* throw the
readings off, and then, you're left with meaningless numbers that can't be
compard to anything -- and using a UV filter DOES NOT HELP.
Ain't color fun? I like the germain word for color, 'farbe'. In french, when
I pronounce 'farbe' it almost evoke phonetic words like 'soup' or 'blend' or
'mix' or 'garble'. Not to degrade the german language but color does not
easily reveal its secrets. One has to make a strong, conscientious effort to
grasp what the heck it is about and how it works (arbeit).
Roger Breton
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