{
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
}