In the Rampage Client, open the Calibration Editor. Use "Media Linearization" curves to calibrate/linearize the plate...use "Dot Gain Compensation" curves to adjust the dot gain/TVI of the press.
For Dot Gain Compensation, if you have a target TVI curve in mind, that would be used as your "Desired" curve. To complete the curve setup, you have to run a press test at standard densities using LINEAR plates and then measure several press sheets to obtain the "Actual" curve. When you then select both the Actual and Desired curve when imaging plates, you should end up with very close to the target TVI on press.
There are other curve scenarios such as G7 calibration where you may or may not use both the actual and desired curves. Generally for a G7 calibration, you leave the Actual curve at "None" or linear and create a Desired curve using G7 calibration values from either the CHROMiX Curve/Curve2 software or use the manual "fan graph" paper method.
There is a lot of nuance (and knowledge) on how to approach all of this...but this is the basics.
Terence Wyse, WyseConsul
Color Management Consulting, G7 Certified Expert