Harold,
I completely understand the financial concerns you have regarding getting your lighting compliant with ISO3664. We have done it here, so I know first hand the expense.
But, may I advise you not to settle for "wrong but consistent lighting". At the very least, purchase D50 bulbs from GTI for every location you plan on using for color viewing. Yes, they are more expensive than say a daylight bulb from Home Depot, but they are ISO compliant. That gets you halfway to compliance assuming the light booths are in proper working order.
The verification process can be expensive due to the need of a spectroradiometer as someone else mentioned. But, even if you forego the verification process altogether at this time, using the correct bulbs will pay dividends for you.
Regards,
------------------------------
Patrick Hundley
Color and Graphic Reproduction Manager
Hammer Packaging Corporation
West Henrietta NY
(585) 350-0150
------------------------------
Original Message:
Sent: 09-10-2018 03:37 PM
From: Harold Anderson
Subject: Metamerism gauges in evaluating K5000/D50 lighting
Thank you for replying Robert & Bryan,
After input here and further research I feel that reaching ISO3664:2009 is a bit above the financial reach of this company at this time, considering it would not only mean investment in lighting, fixtures, software and hardware. I think the best approach for this shop is to choose one of the indicators and use it to achieve "consistent" lighting, thinking "even if it's "wrong" at least it's consistent". Which that will be a giant step considering the various conditions we have presently.
Robert:
I am going with the indicator in the back of the Pantone books. My reasons are these:
"The reason you are getting different results from the two color pairs is because they were formulated to appear to match under different light sources (in GTI's case we used our Graphiclite D50..."
Knowing that the Metamerism indicator is tested/created for analyzation under GTI lighting, which is priced above the possibilities of this shop currently. I'm hoping the Pantone's indicator might have somehow been more inclusive, or developed under less "controlled" D50 lighting.
Bryan:
Thanks! BabelColor's offerings seem affordable and would be valuable to have in this situation.
Now to balance quality of lighting/color evaluation with the Owner's bottom line.
------------------------------
Harold Anderson
AAA Printing & Graphics
Bellevue WA
Original Message:
Sent: 09-06-2018 10:02 AM
From: Bryan Irvine
Subject: Metamerism gauges in evaluating K5000/D50 lighting
You could try BableColor CT&A with an i1io2 and get a better idea how close your viewing
areas are to hitting ISO 3664. It is not going to be as good as an expensive light meter.
But if you already have the i1io2, the software isn't too expensive.
its here BabelColor - Color Measurement and Analysis Software
------------------------------
Bryan Irvine
Digital Solutions Specialist
The Advantage Group
Caledonia MI
(616) 558-1101
Original Message:
Sent: 08-29-2018 04:04 PM
From: Harold Anderson
Subject: Metamerism gauges in evaluating K5000/D50 lighting
I'm trying to get better lighting in key areas around our shop. In the process I've come across two gauges that supposedly indicate when a light source is correct. But both show different results when under the same source (LED and fluorescent tube), but are the same under daylight.
The two gauges are the Metamerism gauge produced by Visual Color, marketed for GTI lighting
metamerism
The other is the D50 indicator in the back of the Pantone books, similar to the proof stickers they sell here
Pantone Lighting Indicator Stickers D50
Does any knowledgeable soul have an educated opinion on which gauge is accurate and should be used?
Thanks
------------------------------
Harold Anderson
AAA Printing & Graphics
Bellevue WA
------------------------------