15.如何将彩色图像转换成黑白图像？\MainFrm.cpp
.................................\MainFrm.h
.................................\ReadMe.txt
.................................\res\Test.ico
.................................\...\Test.manifest
.................................\...\Test.rc2
.................................\...\TestDoc.ico
.................................\...\Toolbar.bmp
.................................\Resource.h
.................................\stdafx.cpp
.................................\stdafx.h
.................................\Test.aps
.................................\Test.cpp
.................................\Test.h
.................................\Test.ncb
.................................\Test.rc
.................................\Test.sln
.................................\Test.suo
.................................\Test.vcproj
.................................\TestDoc.cpp
.................................\TestDoc.h
.................................\TestView.cpp
.................................\TestView.h
.................................\Release
.................................\res
15.如何将彩色图像转换成黑白图像？