8

Output Rollout 1431
Clamp—
When on, t his parameter limits the values
of the colors to no greater than 1.0. Turn this
on when you’re increasing the RGB Level, but
don’twantthemaptoappearself-illuminated.
Default=off.
Note: If you set the RGB Offset to a value greater
than 1.0 while Clamp is on, all colors become
white.
Alpha from RGB Intensity—When on, an alpha
channel is generated based on the intensity of
theRGBchannelsinthemap. Blackbecomes
transparent and white becomes opaque.
Intermediate values are translucent according to
their intensity. Default=off.
Enable Color M ap—Turn on to us e the Col or Map.
See “Color Map group.” Default=off.
Outpu t A mount —Controls the amount of the
map being mixed into a composite material.
Affects the saturation and alpha value of the m ap.
Default=1.0.
RGB Offset—Adds to the RGB values of the map
colors by the amount set by the spinner, w hich
affects the tonal value of the colors. Ev entually
the map becomes white and self-illuminated.
Lowering the value decreases the tonal va lue
toward black. Default=0.0.
RGB Level—Multiplies the RGB values of the map
colors by the amount set by the spinner, w hich
affects the saturation of the color. Ev entually the
map b ecomes f ully saturated and
self-illuminated
(page 3–1103)
. Lowering the value decreases
the saturation and makes the map colors grayer.
Default=1.0.
Bump Amount—Adjusts the amount of bumpiness.
Thisvaluehasaneffectonlywhenthemapisused
as a bump map. Default=1.0.
For example, suppose you have a map instanced
forboththeDiffuseandtheBumpcomponents.
If you want to adjust the amount of bumpiness
w ithout affecting the Diffuse colors, adjust this
value, which changes the amount of bumpiness
w ithout affecting the map’s use in other mate rial
components.
Color Map group
At the bottom of the Output rollout, t he Color
Map group is inactive until you turn on Enable
Color Map.
The Color Map graph lets you adjust the tonal
range of an image. The point at 1,1 controls
highlights, the point at 0.5,0.5 controls midtones,
andthepointat0,0controlsshadows.
You adjust the shape of the graph by adding points
tothelineandmovingorscalingthem.Youcan
add Corner , Bezier-Smooth, or Bezier-Corner
points. When a move or scale option is active,
points can be selected much like objects in a
viewport, by clicking a point, dragg ing a region
around one or more points, and holding down
CTRL to add or subtract from the selection.
When you select an individual p oint, its exact
coordinates are displayed in the two fields
below the graph at the lower left. You can enter
values directly in these fields, but the values are