---
name: "plgcol0a"
section: "3plplot"
platform: "linux"
package: "plplot-doc"
version: "5.15.0+dfsg2-15"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/plgcol0a"
---

# plgcol0a(3plplot)

Returns 8-bit RGB values and PLFLT alpha transparency value for given color index from cmap0

## NAME

**plgcol0a** - Returns 8-bit RGB values and PLFLT alpha transparency value for given color index from cmap0

## SYNOPSIS

**plgcol0a**(*icol0*, *r*, *g*, *b*, *alpha*)

## DESCRIPTION

Returns 8-bit RGB values (0-255) and PLFLT alpha transparency value (0.0-1.0) for given color from cmap0 (see the PLplot documentation).  Values are negative if an invalid color id is given.

Redacted form: **plgcola(r, g, b)**

This function is used in example 30.

## ARGUMENTS

- *icol0* (**PLINT**(3plplot), input)

  Index of desired cmap0 color.

- *r* (**PLINT\_NC\_SCALAR**(3plplot), output)

  Returned value of the red intensity in the range from 0 to 255.

- *g* (**PLINT\_NC\_SCALAR**(3plplot), output)

  Returned value of the green intensity in the range from 0 to 255.

- *b* (**PLINT\_NC\_SCALAR**(3plplot), output)

  Returned value of the blue intensity in the range from 0 to 255.

- *alpha* (**PLFLT\_NC\_SCALAR**(3plplot), output)

  Returned value of the alpha transparency in the range from (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.