Re: Creating Proofs for ISO Coated & FOGRA Proof Verification
Re: Creating Proofs for ISO Coated & FOGRA Proof Verification
- Subject: Re: Creating Proofs for ISO Coated & FOGRA Proof Verification
- From: Joseph Yates <email@hidden>
- Date: Mon, 11 Dec 2006 21:18:38 -1000
- Thread-topic: Creating Proofs for ISO Coated & FOGRA Proof Verification
Title: Re: Creating Proofs for ISO Coated & FOGRA Proof Verification
on 7/15/06 4:06 AM, Klaus Karcher at email@hidden wrote:
> How well a certain Delta E conforms to the visual assessment depends on
> numerous aspects. Some of the most important are:
> - size and distance of the probes
> - surround conditions
> - illumination (Luminance, ...)
> - applied color distance formula
>
> E.g if you compare results of DE76 (which is still in use for the FOGRA
> Media Wedge evaluation) with DE94 (which is used by most measurement
> device manufacturers to define the precision of their instruments) and
> DE00 (which is known to have the best conformance to to the visual
> assessment by now) in the yellow region, you will determine that a DE94
> or DE00 of 1 goes along with a DE76 of up to 5.4!
>
> Be aware of the precision of usual measurement devices which is in the
> same order of magnitude.
In setting up the ORIS Certified Proof – I am given a choice of Tolerances
of “Standards” like FOGRA / 3DAP / SICOGIF / or SWOP
Along with using 2-Level Tolerances (for example a low or strict value / and a higher or less strict value)
But it also allows selection of the Delta E formula used to calculate color deviations:
Considering what Klaus says about dE00 having the best conformance to the visual assessment – and ORIS stating that the dE94 and dE2000 give more weight to chromaticity, which comes closer to what the human eye perceives...
Would I be better served to change from dE to one of these other formulas in creating a more visually (and still numerically) accurate proof?
Joseph Yates
Pacifica Island Art, Inc.
Maui, Hawaii
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