8

Compositor Maps 1497
The choice of colors, along with grain pattern, is
the primary way to represent different types of
wood. In fairly uniform woods like yellow pine or
redwood,thetwocolorsareoftennearthesame
settings (examples B and C). Lighting also makes a
difference in the apparent colors.
A: Default colors
B: Color #1=RGB 160,125,50
Color #2=RGB 170,135,25
C: Color #1=RGB 140,90,0
Color #2=RGB 130,80,50
Grain Thickness=3
Other settings at defaults
Maps—Replacecolorswithmaps.Thecheckboxes
enable or disable their associated maps.
You can assig n maps to one or both of the
Wo o d colo r slot s . A ny k i n d of map c a n b e u s e d ,
includingWood.Themapoverridestheassigned
color, which has no effect.
The left box uses defaults. The right box is t he
same,exceptthatColor#1hasbeenreplacedwith
a Checker map, whose colors have been changed
to wood tones.
Left: Default
Right: Color #1 replaced with Checker map
Grain Thickness=3
Other settings at defaults
Compos itor
Comp ositors are meant specifically for
compositing other colors or maps. In image
processing, compositing images refers to
superimposing two or more images to combine
them.
Thefollowingcompositormapsaresuppliedwith
the software:
Composite (page 2–1498) :Compositesmultiple
maps. Unlike Mix, Composite doesn’t have explicit
controls for the amount of mixing. Instead, it bases
the mix amount on the maps’ alpha channel.
Mask (p age 2–1499) : A mask is a map itself, used
in this case to control where a second map is
applied to the surface.
Mix (page 2–1499) :Mixmixestwocolorsortwo
maps. You can adjust the amount of mixing using
a blend level you specify. The blend level can be
mapped.
RGB Multiply (page 2–1501) :Combinestwomaps
by multiplying their RGB and alpha values.