Digital BW, The Print

Hi!
I intend to calibrate my HP G4050 in order to make ICCs for some 
watercolor papers I have. I am following Paul Roark�s directions 
(http://paulroark.com/BW-Info/Making_B-W_ICCs.htm). In this article, 
Paul advises to use highlight, shadow and gamma controls for 
calibration. Vuescan, however, does employ this terminology. My 
question, for those familiar with Vuescan, is: am I right in assuming 
that, in the Color tab, black point and white point controls correspond 
to shadow and highligth, and that brightness correspond to gamma?

Edson