The RGBTRIPLE structure describes a color consisting of relative intensities of red, green, and blue. The bmciColors member of the BITMAPCOREINFO structure consists of an array of RGBTRIPLE structures.
typedef struct tagRGBTRIPLE { // rgbt
BYTE rgbtBlue;
BYTE rgbtGreen;
BYTE rgbtRed;
} RGBTRIPLE;
See: