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