X-Rite Response Concerning Optical Brighteners (Correct?)
X-Rite Response Concerning Optical Brighteners (Correct?)
- Subject: X-Rite Response Concerning Optical Brighteners (Correct?)
- From: Rick Gordon <email@hidden>
- Date: Wed, 18 Apr 2007 13:19:33 -0700
I had written a support query to X-Rite concerning a query that had been threaded on this list back in March under the subject "Please check this conifg for me and give your opinion". I can't reproduce my original query to X-Rite as it was sent via a web form.
I had run a test confirming to myself that ProfileMaker only adjusted for optical brighteners with perceptual rendering (see below), and have also read confirmations of the same on the web (thoughout the ColorBurst RIP support forum) and in the ColorSync forum.
Yet X-Rite wrote back with the following response:
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>The following solution is copied directly from our on-line knowledgebase. I am certain that it will resolve your issue. We did ask Engineering to address your question as to whether PM5 and Eye-One Match 3.6.1 compensates for optical brighteners in all rendering intents and they assured us that they do compensate for all intents.
>. . . (some basic background information defining the use of optical brighteners deleted) . . .
>Recommendation:
>A UV cut filter is not needed when using ProfileMaker or Eye-One Match software. The ProfileMaker Professional and the Eye-One Match software can detect and compensate optical brighteners (PM: optionally, i1 Match: automatically).
>A UV cut may be helpful when measuring papers with optical brighteners using other software such as MonacoPROFILER.
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I'd love to believe they are right, but I'm not convinced. Can someone convince me?
Rick Gordon
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On 3/28/07 at 11:51 PM -0700, Rick Gordon wrote in a message entitled
"Re: Please check this conifg for me and give your opinion":
>A quick test based on setting color samplers in neutral, warm, and cool light areas on the PhotoDisc test image, duplicating the file three times, and converting, using ProfileMaker-generated RGB profiles from the same set of measurements (from an Epson 2200 printing to Heavyweight Matte) as follows, shows:
>
>* AbsCol: identical values regardless of optical brightener correction
>
>* Perceptual: OB-corrected version has B values 1-3 points higher and R values 0-2 points lower than non-OB-corrected version. (G values remain consistent throughout)
>
>So, based on that small test, I'd have to concur with John's conclusion, although it's certainly not clearly spelled out in the ProfileMaker documentation.
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___________________________________________________
RICK GORDON
EMERALD VALLEY GRAPHICS AND CONSULTING
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WWW: http://www.shelterpub.com
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