EXact X-Rite User's Guide download pdf (Page 43)

X-Rite eXact™ Instrument

Paper Indices Function

This function can report data for Yellowness, Whiteness, and CIE Tint. Depending on the

function settings, 1 to 4 lines of data can be shown. Up to 4 of the following formulas can be

chosen for displaying in this function. Whiteness (E313-98, Berger, Stensby), Yellowness

(E313-98, D1925), CIE Tint, and Brightness. Difference values will show up on the right half of

the display when a valid standard is present.

Paper Indices Function Setting

Tap the Paper Indices button and select the paper indices that appear after a measurement. Up to

four indices can be selected for the function. Refer below for available options.

• Yellowness E313 and Yellowness 1925: used to evaluate white and near-white samples.

These samples yield numbers which correlate with visual rating of yellowness.

• Whiteness E313, Whiteness Berger and Whiteness Stensby: used to evaluate white and

near-white samples. These samples yield numbers which correlate with visual rating of

whiteness.

• CIE Tint: whiteness and tint play a similar role to a* and b* for white papers. Negative values

of tint correspond to reddish shades. Positive values of tint correspond to greenish shades.

• Brightness used to determine a blue reflectance of white, near-white, and naturally colored

pulp, paper, and paperboard.

Paper Indices Measurement

Paper Indices measurement displays the index value(s) for the measured surface. Up to four

indices values can be displayed at one time.

1. Select Paper Indices function.

2. Measure paper sample.

3. View data.

Opacity Function

This function is used to determine how opaque a given ink or material is. It looks at how different

the luminance (Y from CIEXYZ) of a given sample changes when printed over a white or black

substrate. Once the ink is measured over both substrates, the opacity % result is provided (0 =

completely transparent, 100% = completely opaque).

This function is not available in the Job Tool.

Opacity Measurement

The Opacity function displays the percent opacity of a drawn down sample on an opacity card.

1. Measure the sample over the black portion of the opacity card.

2. Measure the sample over the white portion of the opacity card.

Function, illum/obs, and

Measurement Condition selected

Whiteness value

Simulated color and timestamp of

reading displayed

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 103 104

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EXact X-Rite User's Guide Page 43