From Linux Man Pages
gvcolor [ files ]
NAME
gvcolor - flow colors through a ranked digraph
( previously known as colorize )
USAGE
dot file.dot | gvcolor | dot -T<format>
DESCRIPTION
gvcolor is a filter that sets node colors from initial seed values. Colors flow along edges from tail to head,
and are averaged (as HSB vectors) at nodes. The graph must already have been processed by dot. Appropriate
choice of initial colors yields drawings in which node colors help to emphasize logical relationships between
nodes, even when they are spread far apart in the layout.
Initial colors must be set externally, using the color attribute of a node. It is often effective to assign col-
ors to a few key source or sink nodes, manually setting their colors by editing the graph file. Color names are
as in dot(1): symbolic names or RGB triples. It is best to choose some easily-distinguished but related colors;
not necessarily spaced evenly around the color wheel. For example, blue_green, green, and light_yellow looks
better than red, green, blue.
Certain graph attributes control the gvcolor algorithm. flow=back reverses the flow of colors from heads to
tails. saturation=.1,.9 (or any two numbers between 0 and 1) adjusts the color saturation linearly from least to
greatest rank. If Defcolor is set, this color value is applied to any node not otherwise colored.
EXIT STATUS
The following exit values are returned:
0 Successful completion.
1 If nodes of the graph do not possess a ``pos attribute.
BUGS
It would be nice to make the program work without relying on an initial pass through dot.
RELATED
gc(1), dot(1), gvpr(1), ccomps(1), sccmap(1), tred(1), libgraph(3)
CATEGORY