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procedure TForm1.Button1Click(Sender: TObject);
var
  jpegimage :TJPEGImage;
  stream : TMemoryStream;
begin
try
  jpegimage := TJPEGImage.Create;
  stream := TMemoryStream.Create;
  TBlobField(ADODataSet1.FieldByName('Bild')).SaveToStream(stream);
  jpegimage.LoadFromStream(stream);
  jpegimage.SaveToFile('E:\Test.jpg');
except
  on e:exception do begin
    ShowMessage(e.Message);
  end;
end;
end;                    

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try
  Stream:=TMemoryStream.Create;
  JP:=TJpegImage.Create;
  TaBilderP_Data.SaveToStream(Stream);
  Stream.Position:=0;
  JP.LoadFromStream(Stream);
  Image.Picture.Bitmap.Assign(JP);
finally
  Stream.Free;
  JP.Free;
end;