Datacolor 45IR User Guide, 5.2014, Version 1.0 (4230-0402M)
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Whiteness / Yellowness
Whiteness
and
Yellowness
indices are quality parameters important for the paper industry. Datacolor 45IR
displays the whiteness and yellowness indices according to the following standards.
CIE Whiteness index:
Values are usually between 90 and 120 for “white” paper. The
higher the value, the whiter or brighter the paper is. Artificial optical
brighteners in the paper will lead to high values as well.
D-1925 Yellowness index:
If the Yellowness Index is a positive value, the paper has a yellow cast.
If the Yellowness Index is a Negative value, the paper has a blue cast.
PASS / FAIL
The
Pass / FAIL
function shows at a glance if a measured sample is greater than or less than the tolerance
about a reference value.
First, set the allowable limits of the ∆E*ab tolerance.
Select in the menu section of the measurement conditions the item
Pass / FAIL tolerance
and edit the desired tolerance value by pressing
the arrow buttons.
Every sample measurement is compared to the reference.
If the color distance is within the set tolerance (in this case 2.72 < 3.0),
PASS will be displayed.
For out of tolerance measurements, accordingly FAIL will be shown
accompanied by an acoustic signal of three short beeps.
