Re: CMYK converter
Re: CMYK converter
- Subject: Re: CMYK converter
- From: Terence Wyse <email@hidden>
- Date: Sat, 24 Apr 2010 23:19:01 -0400
On Apr 24, 2010, at 9:36 PM, Marco Ugolini wrote:
> In a message dated 4/24/10 5:49 PM, Terry Wyse wrote:
>
>> I'll throw my penny's worth in.
>>
>> Why not SWOP2006_Coated3 as "standard" separation profile? It represents a
>> rather "gender-neutral" print condition that is perfect as a publication
>> profile. Paper white of this profile is a neither too-bright/too-dark nor
>> too-yellow/too-blue L*a*b* value of L92.5 a0 b0.
>>
>> While GRACoL Coated1 might too far on the commercial side, SWOP_Coated5
>> represents a printing condition and paper white (L90 a0 b+4) that is only used
>> by "down and dirty" catalog printers that I find not very typical. SWOP
>> Coated3 represents a nice middle ground that I think is more typical of web
>> offset printing today than either US Web Coated (SWOP) v2 or SWOP Coated5. It
>> might be the ideal "Generic" CMYK profile.
>
> Hi Terry.
>
> Worth a thought, certainly.
>
> But I'll play devil's advocate for a second, if I may.
>
> Compared to SWOP_Coated3, GRACoL's SWOP_Coated5 produces an overall closer
> colorimetric match to the print conditions listed in US Web Coated (SWOP)
> v2, including their respective white points (L90.4 a0 b4.1 in the former,
> L88.7 a-0.25 b3.64 in the latter, a difference of 1.2 DeltaE 2000).
etc....
My point was that "US Web Coated (SWOP) v2" no longer represents typical print conditions for web offset printing on coated paper, despite the name of the profile...so why use it?
I get around to a fair number of commercial and publication web printers as well as working with magazine publishers that need to produce internal proofs of their magazine titles. As a result, I've measured lots of papers and magazines and can say with a fair amount of certainty that the paper cast of these press stocks is almost always either neutral or slightly blue (-b*) ....almost never yellow anymore unless it's the very low-end of the catalog printers. Even then, the paper is usually not of the coated variety but it is either SCA or similar uncoated papers. If I were to characterize typical web offset stocks, they'd be in the L* range of 91-94 and with a b* range of 0 to -2....at least that's what I'm seeing. You simply don't see #5 groundwood papers being used anymore. For me, "US Web Coated (SWOP) v2" now represents *atypical* web offset print conditions.
Terry
______________________________________
Terence Wyse, WyseConsul
Color Management Consulting
G7 Certified Expert
FIRST Level II Implementation Specialist
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