---
name: "plscolbga"
section: "3plplot"
platform: "linux"
package: "plplot-doc"
version: "5.15.0+dfsg2-15"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/plscolbga"
---

# plscolbga(3plplot)

Set the background color by 8-bit RGB value and PLFLT alpha transparency value.

## NAME

**plscolbga** - Set the background color by 8-bit RGB value and PLFLT alpha transparency value.

## SYNOPSIS

**plscolbga**(*r*, *g*, *b*, *alpha*)

## DESCRIPTION

Set the background color (color 0 in cmap0) by 8-bit RGB value and PLFLT alpha transparency value (see the PLplot documentation).

This function is used in example 31.

## ARGUMENTS

- *r* (**PLINT**(3plplot), input)

  Unsigned 8-bit integer (0-255) representing the degree of red in the color.

- *g* (**PLINT**(3plplot), input)

  Unsigned 8-bit integer (0-255) representing the degree of green in the color.

- *b* (**PLINT**(3plplot), input)

  Unsigned 8-bit integer (0-255) representing the degree of blue in the color.

- *alpha* (**PLFLT**(3plplot), input)

  Value of the alpha transparency in the range (0.0-1.0).

## AUTHORS

Many developers (who are credited at http://plplot.org/credits.php) have contributed to PLplot over its long history.

## SEE ALSO

PLplot documentation at http://plplot.org/documentation.php.