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ISO 12647-7

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ISO 12647-7

Subject: ISO 12647-7
From: Lee Badham <email@hidden>
Date: Mon, 21 May 2007 16:02:58 +0100

Hi list

I'm hoping someone one this list can clarify something from the new ISO 12647-2 proofing standard.

There are now hue tests for the grey balance on a proof. This is a good thing in my opinion.

The standard lists the tolerances as average ∆H <=1.5, but doesn't list how ∆H is calculated. I'm assuming it is done using only the a and b co-ordinates of the lab value of the cmy, and black patches. It's just that using ∆H is confusing to me as H represents the hue angle of a colour. As we are dealing with grey colours, the hue angle itself can vary wildly, for a very small ∆Eab.

Thanks

Lee Badham
Bodoni Systems Ltd
www.bodoni.co.uk

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