After applying a map and setting its internal parameters, you can adjust its output parameters to determine the rendered appearance of the map.
These controls appear on the Output rollout for a number of 2D and 3D maps:
For example, suppose you have a map instanced for both the Diffuse and the Bump components. If you want to adjust the amount of bumpiness without affecting the Diffuse colors, adjust this value, which changes the amount of bumpiness without affecting the map's use in other material components.
The Color Map settings at the bottom of the Output rollout are available only when Enable Color Map is on (see preceding).
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, and the point at 0,0 controls shadows.
You adjust the shape of the graph by adding points to the line and moving or scaling them. You can 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, dragging a region around one or more points, and holding down Ctrl to add or subtract from the selection.
When you select an individual point, 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 automatically constrained as they are when you manually move or scale a point.
You can zoom into the graph to make detailed adjustments. As you zoom in, the graph updates to show decimal measurements along the left vertical axis. You can pan anywhere on the graph with the horizontal and vertical scroll bars, use a button option, or the middle mouse button. Points can be deleted, and you can reset the graph to its default at any time.
The following controls affect the points on the graph:
Constrains movement to the horizontal.
Constrains movement to the vertical.
On a Bezier smooth point, you can move the point or either handle.
Adds a Bezier smooth point anywhere on the graph line. Handles attached to the point create smooth curves when moved.
When either Add Point button is active, you can use Ctrl+click to create the other type of point. This eliminates the need to switch between buttons.
The following controls affect the view of the graph. The change in view does not affect the graph’s results.