c++Builder 像素操作[原创]

[点评:这里只是介绍用BCB转化彩色图片为灰度图片,由此可引申更多操作,像图像旋转,翻转及各种特效,不过这种算法速度有点慢.]

1\头文件中变量定义:
        TColor cl;
        Graphics::TBitmap *bitmap1;
        Graphics::TBitmap *bitmap2;
        long tm;
        int thecl[320][240];
        mycolor thecolor[320][240];
        AnsiString str;
        int hd[320][240];
2\初始化变量
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
        tm=0;
        bitmap2=new Graphics::TBitmap();
        bitmap1=new Graphics::TBitmap();
}
3\加载位图
void __fastcall TForm1::ToolButton1Click(TObject *Sender)
{

        try
        {
                bitmap1->LoadFromFile("cat.bmp");
        }
        catch(...)
        {
                ShowMessage("error:load file");
        }
        bitmap2->Assign(bitmap1);
}
4\显示位图
void __fastcall TForm1::ToolButton2Click(TObject *Sender)
{
        PaintBox1->Canvas->Draw(0,0,bitmap1);       
}
5\将位图的每个像素色值保存在数组中
void __fastcall TForm1::ToolButton3Click(TObject *Sender)
{
        Timer1->Enabled=TRUE;
        ProgressBar1->Min=0;
        ProgressBar1->Max=240*320;
        ProgressBar1->Position=0;
        for(int i=0;i<240;i++)
        {
                for(int j=0;j<320;j++)
                {
                        cl=bitmap1->Canvas->Pixels[j][i];

                        thecolor[j][i].r=GetRValue(cl);
                        thecolor[j][i].g=GetGValue(cl);
                        thecolor[j][i].b=GetBValue(cl);
                        //str.sprintf("r=%d,g=%d,b=%d",thecolor[j][i].r,thecolor[j][i].g,thecolor[j][i].b);
                        //ListBox1->Items->Add(str);
                        ProgressBar1->Position++;

                }
        }
        Timer1->Enabled=FALSE;
        Label1->Caption=tm;       

}
6\将彩图转换为灰度图
void __fastcall TForm1::ToolButton4Click(TObject *Sender)
{
        TColor huiduColor;
        long sb;

        ProgressBar1->Min=0;
        ProgressBar1->Max=240*320;
        ProgressBar1->Position=0;
        for(int i=0;i<240;i++)
        {
                for(int j=0;j<320;j++)
                {
                        sb=(thecolor[j][i].r*9798+thecolor[j][i].g*19235+thecolor[j][i].b*3735)/32768;
                        huiduColor=RGB(sb,sb,sb);
                        hd[j][i]=sb;
                        bitmap2->Canvas->Pixels[j][i]=huiduColor;
                        ProgressBar1->Position++;
                }
        }
       
}