Re: Color management software for Epson 9800
> wish we could use our current solution, but the combo we have is out of tolerance on: IT8/7.4 (All patches) (Average Delta E ab 1.98, should be less than or equal to 1.5) 50/40/40 Neutral Gray (Delta E ab 2.40, should be less than or equal to 1.5) UGRA/FOGRA Media Wedge (Average Delta E ab 2.02, should be less than or equal to 1.5) Note: These results are from the IPA Proofing RoundUp.
Keep in mind that the tolerances used for analysis for the IPA roundup were intentionally challenging and meant to give a direct comparison to the venders own results. The tolerances came from the Gracol/SWOP proofing +system+ certification (not proof +provider+ certification, though that will likely come in the future). These tolerances might be a bit tight for consumer level and the IPA white paper indicated that an average delta E of 2 for a working environment is considered generally acceptable.
The Fogra Media wedge values were actually values taken directly out of the larger IT87/4 target and demonstrates the difficulty in defining tolerances. One would assume that if the IT87/4 chart passes tolerance that the smaller control bar would as well, but this is sometimes not the case (smaller number of patches to average, including all primaries and secondaries which have a dE tolerance of 5 on them individually). The only metric you mentioned that would concern me is the gray balance of 2.4, which may be showing the issues of using UV filtration (but if I recall correctly, your paper white patch passed tolerance, which is what I found confusing).
>Does GMG require UV filtration?
GMG doesn't require UV filtration and will work with or without UV filtered devices as long as it is a supported measurement device. So GMG will allow a user to iterate a proofing profile using UV filtration toward a published data set such as Gracol2006_Coated1 which is not uv filtered...the results of which would give a false sense of security in that the low delta E numbers might not be accurate. In this case youd' want to confirm you results with a non-uv filtered device in some way.
Edited by: Michael Eddington on Oct 9, 2007 11:14 AM
Edited by: Michael Eddington on Oct 9, 2007 11:14 AM