Информация о BMP-файлах

{
  This tip show, how to get the filesize, width, height, bitcount and color used 
  from a bitmap. 

  Dieses Beispiel zeigt, wie man Dateigrosse, breite, hohe, Farbtiefe und Farbanzahl 
  von einem Bitmap ausliest. 
}


procedure TForm1.Button1Click(Sender: TObject);
var
  fileheader: TBitmapfileheader;
  infoheader: TBitmapinfoheader;
  s: TFilestream;
begin
  s := TFileStream.Create('c:\YourBitmap.bmp', fmOpenRead);
  try
    s.Read(fileheader, SizeOf(fileheader));
    s.Read(infoheader, SizeOf(infoheader));
  finally
    s.Free;
  end;
  listbox1.Items.Clear;
  listbox1.Items.Add('Filesize:    ' + IntToStr(fileheader.bfSize));
  listbox1.Items.Add('Width:       ' + IntToStr(infoheader.biWidth));
  listbox1.Items.Add('Height:      ' + IntToStr(infoheader.biHeight));
  listbox1.Items.Add('BitCount:    ' + IntToStr(infoheader.biBitCount));
  listbox1.Items.Add('Used:        ' + IntToStr(infoheader.biClrUsed));
end;

{ 
 BitCount: 
 1 = black/white 
 4 = 16 colors 
 8 = 256 colors 
}