Uncoated UV and maximum gamut

[jstotz]

I'm going to be characterizing a UV press on uncoated paper. I'll be using the GRACoL aim points in SpotOn as a target while on press, but I know I won't get there. However, I do want to get the maximum gamut possible, which might mean running the inks somewhat heavier than normal. Does anyone have any advice about the relationship between more saturated a and b values and darker L values? In other words, as I run my inks up, the solids will get more saturated, but they'll also get darker. Should I go for maximum saturation and not worry about the L dropping, or is there a point at which I should stop? Will this be determined by the L value, or by too much ink to be runnable? Should I keep the L value as close to GRACoL as I can or is that irrelevant since the a and b won't match either.

 

[gordo]

If you're targeting the maximum gamut then you are no longer aiming at GRACoL.
Run your ink densities up and don't worry about the L*.

A posting here: The Print Guide: Printing at DMaxx - maximizing the CMYK gamut explains the process for increasing gamut with conventional offset, it's basically the same process for UV.

best, gordo