EXact X-Rite User's Guide download pdf (Page 38)

X-Rite eXact™ Instrument

Tone Value Increase (Dot Gain) Function

This function (also called Dot Gain) is the difference between the actual Tone Value % and the

theoretical screen % of a tint patch. The theoretical tint percents are configured by the TVI

function settings (1 to 3 patches). Job tools will ignore these settings when using a Job template,

which will contain its own Tint % definitions.

Tone Value Increase Function Setting

Tap the Tone Value Increase button and set up to three tint patch percentages for tint

measurements. Typically, these values are 25%, 50% and 75%, or 40% and 80%, however, you

can also enter custom values.

Tone Value Increase (Dot Gain) Measurement

Displays tone value increase for the selected color. The TVI settings define how many tint patches

are used. Up to 3 tint patches can be specified or a minimum of one. If three patches are

specified, a scroll bar appears allowing you to swipe the screen to view the remaining data.

1. Select Tone Value increase (Dot Gain) function.

2. Select Color option if required.

3. Measure paper. Once paper is measured it is not required until there is a new substrate (or

every time the tool is entered).

4. Measure the solid patch.

5. Measure tint patch that corresponds to the measured solid. You can either follow the

measurement sequence on the screen or manually touch the tint patch on the left of the

screen to measure.

6. Continue with additional patches that correspond to the measured solid.

7. View tonal value increase (dot gain) data for the tint patches.

Trapping Function

This function determines how well one solid ink prints over another solid ink (overprinting). Better

coverage ensures a better color gamut. Setting the color response to Auto mode will operate

Trapping with the process inks; use the Spot setting if using spot colors instead.

Trap is calculated using one of three formulas:

Preucil (GATF) Trap formula (factory default)

100

−

Brunner Trap formula

Solid and TVI values

Simulated color and timestamp of

reading displayed

Function, paper, response, and

Measurement Condition selected

Measurement patch steps

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 103 104

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EXact X-Rite User's Guide Page 38