Size 56 is the undocumented `BITMAPV3INFOHEADER`.
It adds the alpha bit mask.
The format is known to be supported by:
- Windows (MS paint, etc.)
- Adobe Photoshop
- Popular web browsers
Size 52 is the undocumented `BITMAPV2INFOHEADER`.
It adds the RGB bit masks.
The format is known to be supported by:
- Adobe Photoshop
- Popular web browsers