Create curve in Rampage

[Greg08]

Running Rampage 10.5 and would like to know the steps on setting up
curves. We added a new press and our standard linear profile is not
working. Thanks for the help.

[gordo]

Running Rampage 10.5 and would like to know the steps on setting up
curves. We added a new press and our standard linear profile is not
working. Thanks for the help.

This post describes the basics of creating curves:
The Print Guide: The principle of dot gain compensation plate curves

You should be able to tailor its principles to your workflow.
best, gordo

[Greg08]

Thank you for explaining what the curve will do
But how do I go about doing it with Rampage?

[TerryWyse]

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.

Terry

[Raymond Ramirez]

good day

Did you resolve your Curve issue in Rampage?

[Greg08]

What I did was ran a linear plate and recorded what the press was printing.
I took those measurements and created a profile (Actual Ryobi) then created
a profile called Desired Ryobi (true screen percents).
When ploted to plate I chose no media lin., Actual Ryobi (press A) and
Desired Ryobi (press D)
Hope this makes sense.
Is there a better way?

[buckeye]

Did you select a media linearization when you ran your linear plate? I would think that you would want to choose a media linearization when plotting to plate along with your Actual and Desired Profile, if that's what you did for your linearized plate.

I have heard of some people though, preferring to run their test plate WITHOUT it being linearized and then letting Rampage adjust accordingly from there.

Thanks,

Erik

[Raymond Ramirez]

Did you select a media linearization when you ran your linear plate? I would think that you would want to choose a media linearization when plotting to plate along with your Actual and Desired Profile, if that's what you did for your linearized plate.

I have heard of some people though, preferring to run their test plate WITHOUT it being linearized and then letting Rampage adjust accordingly from there.

Thanks,

Erik

I have seen people do it 2 ways.. Just like you did or linerize the plate.
Then apply the press curve on top of the linerized plate. This is done this way
Because if you have a major shift in color you can check your linerization on plate instead of going through the process of fingerprinting the press.
This will also establish if there is a problem on press or the plate. The way you did it is ok if you have a consistant plate. If you think your plate manufacture drifts then the linerization with a press compensafion is bettter desired.

[gordo]

Linerizing the plate and then applying a curve in the vast majority of cases is redundant, a waste of time, and can cause workflow and imaging problems. See here for a complete explanation: The Print Guide: To linearize your CtP plates or not?

Best gordo

[buckeye]

Makes perfect sense to me gordo. Less is better. We currently run the two curve set-up but I would like to change it to one. The next time we do a footprint of our press, it will be without plate linearization.

Erik