plgcolbga: Returns the background color (cmap0[0]) by 8-bit RGB value and PLFLT alpha transparency value

`plgcolbga`: Returns the background color (cmap0[0]) by 8-bit RGB value and PLFLT alpha transparency value
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#### `plgcolbga`: Returns the background color (cmap0[0]) by 8-bit RGB value and PLFLT alpha transparency value

`plgcolbga (` | r,
| g,
| b,
| alpha`)`;

Returns the background color (cmap0[0]) by 8-bit RGB value and PLFLT alpha transparency value.

`r` (``PLINT_NC_SCALAR``, output)

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

`g` (``PLINT_NC_SCALAR``, output)

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

`b` (``PLINT_NC_SCALAR``, output)

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

`alpha` (``PLFLT_NC_SCALAR``, output)

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

This function is used in example 31.

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