private void BUT_estoffset_Click(object sender, EventArgs e)
{
//doworkLegacy(TXT_logfile.Text, TXT_jpgdir.Text, 0, true);
double offset = EstimateOffset(TXT_logfile.Text, TXT_jpgdir.Text);
TXT_outputlog.AppendText("Offset around : " + offset.ToString(CultureInfo.InvariantCulture) + "\n\n");
}