||Editing the visual appearance of the volume...
Open a volume data
set of your choice, then press - or select
Volume Editor from the Editor menu. The volume editor
window pops up. Select the transfer function tab.
function is used to assign visual properties (color and opacity)
to the voxels of the volume data set. In the transfer function
window, the transfer function is displayed as four different curves
(for Red, Green, Blue and Alpha). In the diagram, the x-axis
represents the scalar value of a voxels. The corresponding value of
the color component is displayed on the y-axis.
that all the check boxes are cleared, except the one for the alpha
component. Now you edit the opacity of the volume. Use the left
mouse button in the editor window to paint the alpha channel.
You can use to left mouse button to draw piecewise linear strokes.
Now select the
color components and try to assign unique colors to the different
parts contained in the data set. Transfer function design is a
time-consuming process and requires some experience. Take your time
to experiment with different settings!