Bitmap ^bmp1;
Bitmap ^bmp2;      

 private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
    // 開啟
    openFileDialog1->Filter = "影像檔(*.bmp)|*.bmp|所有檔案(*.*)|*.*";
    openFileDialog1->FilterIndex = 1;
    openFileDialog1->RestoreDirectory = true;
    openFileDialog1->DefaultExt = ".bmp|.jpg|";
    if(openFileDialog1->ShowDialog() == System::Windows::Forms::DialogResult::OK && openFileDialog1->FileName->Length > 0 )
    pictureBox1->Image =Image::FromFile(openFileDialog1->FileName); // 讀取影像
    String^ str1 = openFileDialog1->FileName;
    bmp1= gcnew Bitmap(str1);
    }

 private: System::Void button2_Click(System::Object^  sender, System::EventArgs^  e) {
    //負片效果
    int i,j;   
    Color rgb,rgb1;
    Byte R1,G1,B1;
    bmp2 = gcnew Bitmap(pictureBox1->Width,pictureBox1->Height);    
    for(j=0;j<>Height;j++)
    for(i=0;i<>Width;i++)
    {
      rgb=bmp1->GetPixel(i,j); // 讀取原影像每一點像素
      // RGB分解
      R1=rgb.R;
      G1=rgb.G;
      B1=rgb.B;     
      //負片方法   
      bmp2->SetPixel(i,j,Color::FromArgb(255-R1,255-G1,255-B1));// 存每一點處理後像素至另一影像
    }      
    pictureBox2->Image= bmp2;
    }