GetCTSeed
GetCTSeed Get unique seed value for color table returns seed value that applies application's color table
GetCTSeed returns a seed value unique to the application's color table and is for use in its ctSeed field.
Returns: a 32-bit long; a value greater than that stored in minSeed.
Notes: GetCTSeed distinquishes the color table from the destination and ensures proper color table translation.