TVI (Tone Value Increase)

TVI is a measure of how much darker a color appears after printing compared to its digital value.  It is computed using density measurement, and for each ink color, three measurements are necessary :- 1) the paper density, 2) the Solid (100%) ink density, and 3) the density of the patch being measured.
Typically a 50% patch is measured, and the measured tone % is subtracted from 50% to compute the Tone Value Increase.

ColorMeter will first ask for the paper to be measured, and the resulting measurement should be saved to the White Register.
It will next ask for an ink color Solid value to be measured, and after measuring, this should be saved to the appropriate Cyan, Magenta, Yellow or Black Register.
ColorMeter automatically detect the ink color being measured, and will display the TVI.

By default Status E (DIN) standard paper relative density measurement is used, consistent with ISO 12647-1, and a 50% patch is assumed.

This can be changed in the TVI Options:

TVI Options

The Tone Value of the patch that is being measured can be changed by entering a value between 0 and 100%.
(Note that if a value of 0% is entered, that the measurement will actually be that of absolute Tone Value, rather than Tone Value Increase.)

In the USA Status T density measurement is sometimes preferred, and this can be selected with a toggle.
Absolute Densitometry can also be selected.

More details about TVI can be found in ISO 12647-1

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