Ich erzeuge eben ein 8 bit Bitmap und will nun die Bilder auf der Festplatte speichern vom Dunklen bis zum Hellen.

for(short i = 0 ; i < 256 ; i++) {
      Graphics::TBitmap *smallImg = new Graphics::TBitmap();
      smallImg->Width = 10; smallImg->Height = 14;
      smallImg->PixelFormat = pf8bit;

      unsigned char *ptr;
      int x=0, y=0;
      ptr = static_cast<BYTE*>(smallImg->ScanLine[y]);
      for(int j=0; j < (smallImg->Height * smallImg->Width); j++) {
         if(x == smallImg->Width) {
            y++;
            x = 0;
            ptr = static_cast<BYTE*>(smallImg->ScanLine[y]);
         }
         ptr[x]= (BYTE) i;
         x++;
      }
      smallImg->Palette = grayPal;
      smallImg->SaveToFile("clusterColor_" + IntToStr(i) + ".bmp");
   }

Die Palette hab ich mit folgendem Code erzeugt:

LOGPALETTE* pal = NULL;
    try {
       pal = (LOGPALETTE*) malloc( sizeof(LOGPALETTE) + sizeof(PALETTEENTRY) * 256);
       pal->palVersion = 0x300;
       pal->palNumEntries = 256;
       for(short i = 0 ; i < 256 ; i++) {
          pal->palPalEntry[i].peRed =  (Byte)i;
          pal->palPalEntry[i].peGreen = pal->palPalEntry[i].peRed;
          pal->palPalEntry[i].peBlue = pal->palPalEntry[i].peRed;
       }
       grayPal = CreatePalette(pal);
    }
    __finally {
       delete pal;
    }