Re: SWOPv2 is dead
Re: SWOPv2 is dead
- Subject: Re: SWOPv2 is dead
- From: Steve Upton <email@hidden>
- Date: Mon, 02 Mar 2015 18:34:02 -0800
> On Mar 2, 2015, at 5:24 PM, Roger Breton <email@hidden> wrote:
>
> Start by comparing their relative "end points". How does 100C in one space compares to 100C in the other space, and so on.
> If they both "represent" ISO-12647-2, their respective colorimetry ought to coincide with that documented in the standard.
> This is easy to check in Photoshop. Just assign one profile after the other to a characterization chart like IT8.7/4 Visual or Random. Make sure you select AbsCol in Conversion options and inspect Cyan, Magenta, Yellow, Black, Red, Green and Blue, paper white, and compare with the standard? If all those end points coincide then you need to dig further, look at 50 percenters in all four colors and their overprints.
ColorThink Pro can do a full vector & numerical comparison of such things as well.
- open the ColorSmarts Guide
- select Evaluate Profile, & then Evaluate Profile Proofing
- drag the profile in question into the Profile area
- drag the characterization data set into both the Reference Data and Measurement Data areas
- click the ‘continue arrow’
ColorThink will open all into the WorkSheet, calculate dE values for all the patches and calculate a summary report.
You can choose to graph the dE list as a set of vectors if you want to visualize the color differences.
For example, the report for GRACoL 2006 is as follows:
"
dE Report
Number of Samples: 1617
Delta-E Formula dE2000
Overall - (1617 colors)
--------------------------------------------------
Average dE: 0.18
Max dE: 0.70
Min dE: 0.02
StdDev dE: 0.06
Best 90% - (1454 colors)
--------------------------------------------------
Average dE: 0.18
Max dE: 0.24
Min dE: 0.02
StdDev dE: 0.06
Worst 10% - (163 colors)
--------------------------------------------------
Average dE: 0.26
Max dE: 0.70
Min dE: 0.24
StdDev dE: 0.05
“
I can perform this test for a few other industry std profiles if you like.
There’s a full description of the process on ColorWiki.com: http://www.colorwiki.com/wiki/Evaluate_Profile_Proofing
regards,
Steve
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