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

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

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

`r` (`PLINT *`, output)

  Pointer to an unsigned 8-bit integer (0-255) representing the degree of red in the color.

`g` (`PLINT *`, output)

  Pointer to an unsigned 8-bit integer (0-255) representing the degree of green in the color.

`b` (`PLINT *`, output)

  Pointer to an unsigned 8-bit integer (0-255) representing the degree of blue in the color.

`alpha` (`PLFLT *`, output)

  Pointer to PLFLT alpha transparency value.

This function is used in example 31.

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