The BITMAPV4HEADER structure contains information about a Win32 version 4.0 bitmap.
typedef struct {
DWORD bV4Size;
LONG bV4Width;
LONG bV4Height;
WORD bV4Planes;
WORD bV4BitCount;
DWORD bV4V4Compression;
DWORD bV4SizeImage;
LONG bV4XPelsPerMeter;
LONG bV4YPelsPerMeter;
DWORD bV4ClrUsed;
DWORD bV4ClrImportant;
DWORD bV4RedMask;
DWORD bV4GreenMask;
DWORD bV4BlueMask;
DWORD bV4AlphaMask;
DWORD bV4CSType;
CIEXYZTRIPLE bV4Endpoints;
DWORD bV4GammaRed;
DWORD bV4GammaGreen;
DWORD bV4GammaBlue;
} BITMAPV4HEADER, FAR *LPBITMAPV4HEADER, *PBITMAPV4HEADER;