Message
Re: Help with RIP
2017-05-12 by sanking@...
When creating a profile with a single gray value where all curves follow the K one of the major goals is to set the Ink Level of each ink in use to the percentage where all have about the same UV blocking. So I opened your print in PS and looked at the density of each of the four inks, and found a patch that matches on each of them, which is about 70%. On the PK you find 70% density at 15%, the C has about 70% density at 20%, the Y is about 70% at 25%, and the LK is 70%.
The purpose of this step is not to find a combination that gives you the total blocking density needed, but simply to find the percentage at which the four inks are balanced in UV blocking. If you have equal UV blocking from the four inks, you should have a smoother look with less appearance of grain.
Now what you have to do is test the profile with a print in your process and determine if it is putting down too much or too little ink. If the print has too much contrast, you will need to reduce the Ink Level of the four inks by the same percentage, if the print is too flat you will need to increase the Ink Level of each ink.
The Ink Level itself, in this profile, is the percent of maximum 100% that a specific ink can lay down at any point on the x-y coordinate.
When you install the profile you can look at in .quad view and you can see that each of the four inks is on a different gama line that is perfectly linear from 0% to 100%, and above those four lines is another line that shows the gama line for the four inks combined.
Hope this makes sense.
Sandy