With no register, each color or plate prints independently or without relation
to all other plates. It does not require registered overlays, merely
instructions to the printer.
Loose register is used for images not requiring highly accurate placement of
the color portions. You make a separate overlay for each color and key this
overlay to the master art. Simplicity in the master artwork is paramount.
Lap register permits a slight overlay in the separate colors or plates. This
simplifies the DM's task in creating the overlays and eliminates white gaps or
spaces which occur if the registration is off. Colors of similar densities that
overlay form a black line, while lapping patterns or textures requires you to
draw a red line between them to avoid moire.
Figure 1-44 shows lap registration.
Figure 1-44.Lap registration.
A hairline register should be left for photomechanical separation by the
camera person or printer. The overlap in a hairline register is negligible.
Save this registration technique for full color or full color continuous tone