BCB实现BMP图片的RGB分解（转）

1、打开BMP图片文件，在Image控件中显示；

  if(dlgOpen1->Execute())

  {

    edt1->Text=dlgOpen1->FileName;

    img1->Picture->LoadFromFile(edt1->Text);

  }

2、逐行扫描图片，获取图片中每点的像素颜色值； color=img1->Canvas->Pixels[i][j];

3、从获取的颜色值中提取R、G、B分量； rgbbuf[0][i][j]=GetRValue(color); rgbbuf[1][i][j]=GetGValue(color); rgbbuf[2][i][j]=GetBValue(color);

BMP与JPG格式的相互转换

函数代码如下,在程序头文件中加入：#include <jpeg.hpp>

void   bmptojpeg(TMemoryStream   *pms)

  {

        TJPEGImage   *j=new   TJPEGImage;

        Graphics::TBitmap   *b=new   Graphics::TBitmap;

        b->LoadFromStream(pms);

        j->Assign(b);

        j->CompressionQuality=;       //等级太高有可能压缩出错！

        j->Compress();

        pms->Clear();

        j->SaveToStream(pms);

        pms->Position=;

        delete   b;

        delete   j;   

  }

  void   jpegtobmp(TMemoryStream   *pms)

  {

      TJPEGImage   *j=new   TJPEGImage;

      Graphics::TBitmap   *b=new   Graphics::TBitmap;   

      j->LoadFromStream(pms);

      j->DIBNeeded();

      b->Assign(j);

      pms->Clear();

      b->SaveToStream(pms);

      pms->Position=;   

      delete   b;

      delete   j;   

  }

要将转换后的流保存成文件可以使用：SaveToFile方法保存；