X - R i t e e X a c t ™ I n s t r u m e n t
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Tone Value (Dot Area) Function
This function (also called Dot Area) provides a way to determine the absolute ink coverage (%) of
a tint or halftone patch by comparing the density value of the tint patch versus known 0%
(Paper/Substrate) and 100% (solid patch) density values. The result can be calculated using
either the Murray-Davies or Yule-Nielsen methods.
The Yule-Nielsen nFactor constants can be adjusted separately for each process ink and Spot colors.
Tone Value Function Setting
Used to set the formula for dot calculation to Murray-Davis or Yule-Nielsen. For the Murray-Davies
formula, the degree of light optical absorption is predefined. For Yule-Nielsen formula, this can be
adapted for different conditions. When Yule-Nielsen formula is selected, Black, Cyan, Magenta,
Yellow, and Spot options appear where you set the coefficients.
Tap the Tone Value button and make selection.
NOTE:
The Yule-Nielsen formula should only be used in special cases, i.e. to determine the
physical area coverage.
Tone Value (Dot Area) Measurement
Displays tone value for the selected color. The procedure requires one solid and one tint
measurement.
1.
Select Tone Value function.
2.
Select Color option if required
3.
Measure paper. Once paper is measured it is not required until there is a new substrate.
4.
Measure solid patch.
5.
Measure tint patch that corresponds to the measured solid.
6.
View tone value data for the tint patch.
7.
Continue with additional tint patches that correspond to the measured solid, or touch the solid
patch on the left of the screen and measure another solid patch.
Solid and tone values
Simulated color and timestamp of
reading displayed
Function, paper, response, and
Measurement Condition selected
Measurement patch steps
CMY values and graph
Simulated color and timestamp of
reading displayed
Function, response, and
Measurement Condition
selected
