Re: Radically different readings from X-Rite 530 and 939 on yellow ink
Re: Radically different readings from X-Rite 530 and 939 on yellow ink
- Subject: Re: Radically different readings from X-Rite 530 and 939 on yellow ink
- From: Klaus Karcher <email@hidden>
- Date: Wed, 23 Dec 2009 00:49:56 +0100
Martin Diers wrote:
When we measure our Acuity print, on any swatch with a significant
amount of yellow ink, our readings are wildly off. Other patches,
however, match their instruments. For example, on a Yellow swatch, we
read a DeltaE of 3.5. Their instruments, two 530s and the 939, read a
DeltaE of 17. The same thing happens on any oranges, and on some other
colors, in lesser degrees. It is consistent, however.
The more Yellow ink, the farther it is off.
Do you use the same color difference formula?
More recent color difference formulas like Delta E 94 or Delta E 2000
give much smaller figures in saturated yellows and correlate much better
with the perceived color difference than Delta E 76.
e.g.:
LAB1: 90 0 85
LAB2: 90 0 98
DE76: 13
DE94: 2.69
DE00: 2.54
Klaus
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