Rethinking Construction - The Adobe Illustrator - page 156

Placing sketch as a template layer
2 Setting Blob Brush tool options and tracing sketch. Putnam wanted to create
marks that were very true to his stylus gestures and had minimal
smoothness. To create this effect with the Blob Brush tool, he first had to
modify the default options. To do this, he double-clicked on the Blob Brush
tool in the Tools panel. In Options, he set Fidelity to 1, Smoothness to 0, and
Size to 5 pt (in CC set one Fidelity slider to Accurate; see “ The New Pencil
Settings (for other tools too) ” section in this chapter's CC introduction for
more about Fidelity changes). From the Size drop-down menu he selected
Pressure, changed Size Variation to 5 pt, and clicked OK (if you don't have a
pen tablet, you can't use Pressure settings). Using these custom Blob Brush
settings, Putnam began to trace the scanned sketch template into the layer
above, varying his stylus pressure to re-create the hand-drawn style.