---
name: "edgepaint"
section: "1"
platform: "linux"
package: "graphviz"
version: "16.1.0-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/edgepaint"
---

# edgepaint(1)

edge coloring to disambiguate crossing edges

## NAME

edgepaint - edge coloring to disambiguate crossing edges

## SYNOPSIS

**\[** *options* \] \[ **-o** *outfile* \] \[ *files* \]

## DESCRIPTION

**edgepaint** takes as input a graph in DOT format with node position information (the *pos* attribute) and colors the edges in a manner making it easier to tell them apart.

## OPTIONS

The following options are supported:

- **--accuracy=***e*

  Accuracy with which to find the maximally different coloring for each node with regard to its neighbors. Default *e* = 0.01.

- **--angle=***a*

  Color two edges differently if their incidence angle is less than *a* degrees. Default *a* = 15.

- **--random\_seed=***s*

  Random seed to use. *s* must be an integer. If *s* is negative, we do \|*s*\| iterations with different seeds and pick the best.

- **--lightness=***l1,l2*

  Only applies for the "lab" color scheme: *l1* and *l2* must integers, with 0 \<= *l1* \<= *l2* \<=100. By default, we use "0,70".

- **--share\_endpoint**

  If this option is specified, edges that share a node are not considered in conflict if they are close to parallel but are on the opposite sides of the node (around 180 degree).

- **-o** *f*

  Write output to file *f* (default: stdout).

- **--color\_scheme=***c*

  Specifies the color scheme.  This can be "rgb", "gray", "lab" (default); or a comma-separated list of RGB colors in hex (e.g., "#ff0000,#aabbed,#eeffaa") representing a palette; or a string specifying a Brewer color scheme (e.g., "accent7"; see https://graphviz.org/doc/info/colors.html#brewer).

- **-v**

  Turns on verbose mode.

- **-?**

  Print usage and exit.

## BUGS

At present, **edgepaint** does not handle graphs with loops or directed multiedges. So, a graph with edges *a -\> b* and *b -\> a* is acceptable, but not if it has edges *a -\> b* and *a -\> b* or *a -- b* and *a -- b*. Ports are ignored in this analysis, so having *a.x -\> b* and *a.y -\> b* is also not supported.

## AUTHOR

Yifan Hu \<yifanhu@yahoo.com\>

## SEE ALSO

[gvmap(1)](/gvmap/1.md), [sfdp(1)](/sfdp/1.md), neato (1), [dot(1)](/dot/1.md)