請問各位前輩: 以下為我要將其反白的區塊 但是為何無反白 而且會出現全白ㄋ  

 Byte *ptr;
 int X,Y;   //紀錄滑鼠位置
 Graphics::TBitmap *bmpDst=new Graphics::TBitmap;
 bmpDst->Width=256;
 bmpDst->Height=256;
 bmpDst->Canvas->CopyMode=cmSrcCopy;
 bmpDst->Canvas->CopyRect(Rect(0,0,bmpDst->Width,bmpDst->Height),
                           Image1->Canvas,Rect(X,Y,X 256,Y 256));
//---------以下為將其作反白效果之處-----------
  for (int y=0;yHeight ;y  )
 {
  ptr=(Byte*)bmpDst->ScanLine[y];
  for (int x=0;xWidth;x  )
    ptr[x]=(Byte)(255-ptr[x]);
 }
  Image2->Picture->Assign(bmpDst);
  delete bmpDst;
 

ayuen您好: 試試改成下面這樣

Byte *ptr;
 int X,Y;   //紀錄滑鼠位置
 Graphics::TBitmap *bmpDst=new Graphics::TBitmap;
 bmpDst->Width=256;
 bmpDst->Height=256;
 bmpDst->Canvas->CopyMode=cmSrcCopy;
 bmpDst->Canvas->CopyRect(Rect(0,0,bmpDst->Width,bmpDst->Height),
                           Image1->Canvas,Rect(X,Y,X 256,Y 256));
//---------以下為將其作反白效果之處-----------
bmpDst->PixelFormat=pf8bit;
 for (int y=0;yHeight ;y  )
 {
  ptr=(Byte*)bmpDst->ScanLine[y];
  for (int x=0;xWidth;x  )
    ptr[x]=(Byte)(255-ptr[x]);
 }
  Image2->Picture->Assign(bmpDst);
  delete bmpDst;

順心 <>～我也是在學習的階段,回答的不好請您多多見諒與指教～

Taishyang版主你好: 怎麼會...變全黑的 阿 是抓錯值嗎

ayuen您好:  在我這邊不會耶,如下圖所示 Source 反白後影像 順心 <>～我也是在學習的階段,回答的不好請您多多見諒與指教～

Taishyang版主你好: 以下為我的顯示結果 但是為何image2只有做1/3的處理ㄋ 之前以別的方式也是會這樣 一直搞不懂能否請版主大哥解疑一下    img]http://delphi.ktop.com.tw/loadfile.php?TOPICID=12059277&CC=269703[/img]  

 
 Byte *ptr;
 Graphics::TBitmap *bmpDst=new Graphics::TBitmap;
 bmpDst->Width=256;
 bmpDst->Height=256;
 bmpDst->Canvas->CopyMode=cmSrcCopy;
 bmpDst->Canvas->CopyRect(Rect(0,0,bmpDst->Width,bmpDst->Height),
                           Image1->Canvas,Rect(X,Y,X 256,Y 256));
//---------以下為將其作反白效果之處-----------
bmpDst->PixelFormat=pf24bit;
 for (int y=0;yHeight ;y  )
 {
  ptr=(Byte*)bmpDst->ScanLine[y];
  for (int x=0;xWidth;x  )
    ptr[x]=(Byte)(255-ptr[x]);
 }
  Image2->Picture->Assign(bmpDst);
  delete bmpDst;

我將其改成以下方式就行摟 < class="code"> Byte *ptr; Graphics::TBitmap *bmpDst=new Graphics::TBitmap; bmpDst->Width=256; bmpDst->Height=256; bmpDst->Canvas->CopyMode=cmSrcCopy; bmpDst->Canvas->CopyRect(Rect(0,0,bmpDst->Width,bmpDst->Height), Image1->Canvas,Rect(X,Y,X 256,Y 256)); //---------以下為將其作反白效果之處----------- bmpDst->PixelFormat=pf24bit; for (int y=0;yHeight ;y ) { ptr=(Byte*)bmpDst->ScanLine[y]; for (int x=0;xWidth;x ) ptr[x*3]=ptr[x*3 1]=ptr[x*3 2]=(Byte)(255-ptr[x*3]); } Image2->Picture->Assign(bmpDst); delete bmpDst; 謝謝Taishyang版主不厭其煩的教導