private void cvtcmap() { for (int i = (1 << bitspersample) - 1; i >= 0; i--) { redcmap[i] = (ushort)(redcmap[i] >> 8); greencmap[i] = (ushort)(greencmap[i] >> 8); bluecmap[i] = (ushort)(bluecmap[i] >> 8); } }