1.首先添加菜单，ID为 IDM_GRAY

2.连接COMMAND 命令函数 void CViewDIB2View::OnOngray()

3.生成、调用类成员函数ChangeToGrayscale( 2, 0.3, 0.59, 0.11)

4.ChangeToGrayscale 调用HPALETTE hPal = ConvertToGrayscale(m_hDib, nMethod, fRedWeight, fGreenWeight, fBlueWeight)

5.调用　　OnRealizePal((WPARAM)m_hWnd,0)

6.使用转口更新　　pDoc->UpdateAllViews(NULL) 该函数把文档被修改的信息通知给每个视图，通常在用户已经通过视图改变文档之后，从视图类中调用此函数，来获取文档被修改的信息。 -1 First add the menu, ID is IDM_GRAY 2. Connect COMMAND command function void CViewDIB2View:: OnOngray () 3. Generation, calling a class member function ChangeToGrayscale (2, 0.3, 0.59, 0.11)　4.ChangeToGrayscale call HPALETTE hPal = ConvertToGrayscale ( m_hDib, nMethod, fRedWeight, fGreenWeight, fBlueWeight)　5. call OnRealizePal ((WPARAM) m_hWnd, 0)　6. with re-update pDoc->　UpdateAllViews (NULL)　document is modified the function to notify the information to each view usually the user has changed after the document through a view from the view class to call this function to get the document to be modified information.