引言:

//---------------------------------------------------------------------------    #include 
#pragma hdrstop    #include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
Graphics::TBitmap *OrgBitmap= new Graphics::TBitmap();//這 裡已經宣告,但COMPILE會出現Undefined OrgBitmap的句子...
  
}
//-------------------------------------------------------------------
void __fastcall TForm1::N2K1Click(TObject *Sender)
{
Graphics::TBitmap *TheBitmap,*TempBitmap;
Byte *ptr, *tptr;
double sum;
unsigned int red,green,blue;
LOGPALETTE MyPalette;
PALETTEENTRY pal[1];
HPALETTE MyPaletteHandle;
//----------------------
TheBitmap=Image1->Picture->Bitmap;
//----------------------
TempBitmap=new Graphics::TBitmap();
TempBitmap->Width=TheBitmap->Width;
TempBitmap->Height=TheBitmap->Height;
TempBitmap->PixelFormat=pf8bit;
//----------------------
MyPalette.palVersion=0x300;
MyPalette.palNumEntries=256;
MyPaletteHandle=CreatePalette(&MyPalette);
for(int i=0;i<256;i  )
{
 pal[0].peRed=i;
 pal[0].peGreen=i;
 pal[0].peBlue=i;
 SetPaletteEntries(MyPaletteHandle,i,1,pal);
}
TempBitmap->Palette=MyPaletteHandle;
//--------------------------------
for(int y=0;yHeight;y  )
{
ptr=(Byte*)TheBitmap->ScanLine[y];
tptr=(Byte*)TempBitmap->ScanLine[y];
for(int x=0;xWidth;x  )
 {
 GetPaletteEntries(TheBitmap->Palette,ptr[x],1,pal);
 red=pal[0].peRed;green=pal[0].peGreen;blue=pal[0].peBlue;
 sum=red*0.299 green*0.587 blue*0.114;
 if(sum>255)
  sum=255;
 if(sum<0)
  sum=0;
  
  //  以128二值化
  if(sum>=128)
    sum=255;
  else 
    sum=0;
  
  tptr[x]=(Byte)sum;
 }
}
//-----------------------
    TheBitmap->Assign(TempBitmap);
    Repaint();
    OrgBitmap->Assign(TheBitmap);
    delete TempBitmap;
}
上述這段程式碼是把彩色的影像轉成灰階,那麼應該如何修改使得灰階變成多層次的呢?如2 level,4 level,8level...等,還有一個問題已經在前面宣告了Orgbitmap,為何compile還會出現Undefined Orgbitmap.呢....煩請各位幫忙解答..3Q