rmat for 32-bit images (no
   BITFIELDS segment). There are 8 bits per color channel, and 8 unused
   bits. The unused bits are set to 0.</td>
 </tr>

 <tr>
  <td>g/rgb32bf.bmp</td>
  <td>3</td>
  <td class=b><img src="rgb24.png"></td>
  <td class=b><img src="../g/rgb32bf.bmp"></td>
  <td>A 32-bit image with a BITFIELDS segment. As usual, there are 8 bits per
   color channel, and 8 unused bits. But the color channels are in an unusual
   order, so the viewer must read the BITFIELDS, and not just guess.</td