How to adjust the substrate colour for the printer profile in GMG?

[Groovy HO]

Hi, anyone know how to adjust the substrate colour in GMG? Many thanks.

 

[ColorGeek]

One way you can handle it is to open your MX4 profile in Profile Editor. Add a "fulcrum" at .1 or .01. Then manually type in 0,0,0,0 for CMYK for the zero fulcrum (paper white). You should see that it's not 0,0,0,0 when you open the MX4. By adding the fulcrum at .01 you protect the rest of the tonal range from any change.