Color-table
index. Except for the special values, the values 0x0000 through 0xnnnn are
allowed color indexes; that is, as many values as are allowed by the size
of the LCT.
Special Values
0x0000
Drawing default
0x0007
White
0x0008
Black
0xFF00
Drawing default
0xFF0n
Color indexes 0x000n, where n is in
the range 1 through 7.