各位好: 我利用Graphics::TBitmap將很多張bmp的圖檔合成一張,合併完之後去查檔案,發現biCompression的值是3,可是我原先的圖是0,請問這如何去變更呢?我試過若 PixelFormat為pf24bit的話biCompression的值是0,但是我需要的是16bit的圖,請各位不吝指教,謝謝 Graphics::TBitmap *BMPDest=new Graphics::TBitmap; Graphics::TBitmap *BMPSour=new Graphics::TBitmap; BMPDest->Canvas->CopyMode=cmSrcCopy; BMPDest->PixelFormat=pf16bit; BMPDest->Width =100; BMPDest->Height=100; BMPSour->LoadFromFile("123.bmp"); BMPDest->Canvas->CopyRect(rect(0,0,50,50),BMPSour->Canvas,rect(0,0,50,50)); BMPSour->LoadFromFile("456.bmp"); BMPDest->Canvas->CopyRect(rect(50,0,100,50),BMPSour->Canvas,rect(0,0,50,50)); BMPDest->SaveToFile("789.bmp"); delete BMPDest; delete BMPSour;

利用BCB做PixelFormat轉換 會存成X4R4G4B4的型式 就會有壓縮

那有何方式可用呢?

    DWORD buffer,bmp1Position,bmp2Position,bmpWidth,bmpHeight;
    WORD bufferwrite;
    int height,width;    Graphics::TBitmap *BMPDest=new Graphics::TBitmap;
Graphics::TBitmap *BMPSour=new Graphics::TBitmap;
BMPDest->Canvas->CopyMode=cmSrcCopy;    //BMPDest->PixelFormat=pf16bit;    BMPDest->Width =100;
BMPDest->Height=100;
BMPSour->LoadFromFile("123.bmp");
BMPDest->Canvas->CopyRect(rect(0,0,50,50),BMPSour->Canvas,rect(0,0,50,50));
BMPSour->LoadFromFile("456.bmp");
BMPDest->Canvas->CopyRect(rect(50,0,100,50),BMPSour->Canvas,rect(0,0,50,50));        TMemoryStream* pms = new TMemoryStream();
    BMPDest->SaveToStream(pms);
    pms->Position=10;
    pms->Read(&bmp1Position,4);
    bmp2Position=bmp1Position;
    pms->Position=10;
    pms->Read(&bmp2Position,4);
    pms->Position=18;
    pms->Read(&bmpWidth,4);
    pms->Position=22;
    pms->Read(&bmpHeight,4);
    pms->Position=28;
    bufferwrite=16;
    pms->Write(&bufferwrite,1);
    for(height=0;heightPosition = bmp1Position;
            pms->Read(&buffer,4);
            bufferwrite = ((buffer&0xF80000)>>9)|((buffer&0x00F800)>>6)|((buffer&0xF8)>>3);
            pms->Position = bmp2Position;
            pms->Write(&bufferwrite,2);
            bmp1Position  =3;
            bmp2Position  =2;
        }
        if(heightPosition = bmp2Position;
                pms->Write(&bufferwrite,2);
                bmp2Position  =2;
            }
        }
    }
    pms->Position=10;
    pms->Read(&bmp1Position,4);
    bmpWidth *=2;
    bmpWidth = bmpWidth (4-bmpWidth%4);
    buffer = bmp1Position   bmpWidth*bmpHeight;
    pms->Position=2;
    pms->Write(&buffer,4);
    pms->SetSize(buffer);
    BMPDest->LoadFromStream(pms);    BMPDest->SaveToFile("789.bmp");
delete BMPDest;
delete BMPSour;
 

這是自己利用程式做24bit轉成16bit 給你參考看看 發表人 - fffhghgjh 於 2005/01/11 19:16:57