* {{Parameter|rgbaColor&}} is the 32-bit ''RGBA'' color value to retrieve the blue component intensity value from.
* ''RGBA'' color values are returned by the [[_PALETTECOLOR (function)|_PALETTECOLOR]], [[POINT]], [[_RGB]], [[_RGB32]], [[_RGBA]] or [[_RGBA32]] functions.
* [[LONG]] intensity values returned range from 0 (no intensity, not present) to 255 (full intensity).