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Uses ...,jpg;
...
procedure TForm1.Button1Click(Sender: TObject);
  var Stream : TMemoryStream;
  begin
    if OpenPictureDialog1.execute then
      Image1.Picture.LoadFromFile(OpenPictureDialog1.FileName);
    Stream := TMemoryStream.Create;
    with ClientDataSet1 do
      begin
        append;
        Image1.Picture.Bitmap.SaveToStream(Stream);
        TGraphicField(fieldbyName('Bild')).LoadFromStream(Stream);
        post;
      end;
    Stream.Free;
end;