ubiquitous field order is: Alpha, Blue, Green, Red (MSB to LSB). The red, green and blue bit masks are valid only when the Compression member of the DIB header is set to BI_BITFIELDS. The alpha bit mask is valid whenever it is present in the DIB header or when the Compression member of the DIB header is set to BI_ALPHABITFIELDS (Windows CE only).

RGB video subtypes

The BITFIELD mechanism described above allows for the definition of tens of thousands of different pixel formats, however only

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