[*Emilio*]

De BMP a JPG

Código Delphi [-]
uses  JPEG;

procedure TForm1.Button1Click(Sender: TObject);
var
  MyJPEG : TJPEGImage;  
  MyBMP  : TBitmap;
begin  
  MyBMP := TBitmap.Create;  
  with MyBMP do    
  try
    LoadFromFile('A.BMP');      
    MyJPEG := TJPEGImage.Create;
    with MyJPEG do 
        begin        
            Assign(MyBMP);
            SaveToFile('A.JPEG');        
            Free;      
        end;    
   finally
      Free;    
   end;
end;

De JPG a BMP

Código Delphi [-]
procedure TForm1.Button2Click(Sender: TObject);
var
  MyJPEG : TJPEGImage;  
  MyBMP  : TBitmap;
begin  
  MyJPEG := TJPEGImage.Create;  
  with MyJPEG do 
     begin
         LoadFromFile('A.JPEG');    
         MyBMP := TBitmap.Create;
         with MyBMP do 
            begin      
                Width := MyJPEG.Width;
                Height := MyJPEG.Height;      
                Canvas.Draw(0,0,MyJPEG);
        SaveToFile('A.BMP');      
                Free;    
             end;    
         Free;  
     end;
end;