Relevant options are now saved in fits header

src/gui.py

@@ -462,7 +462,7 @@ def menu_open_clicked(self, event=None):
         self.prefs["width"] = width
         self.prefs["height"] = height
 
-        tmp_state = fitsheader_2_app_state(self.cmd.app_state, self.images["Original"].fits_header)
+        tmp_state = fitsheader_2_app_state(self, self.cmd.app_state, self.images["Original"].fits_header)
         self.cmd: Command = Command(INIT_HANDLER, background_points=tmp_state["background_points"])
         self.cmd.execute()
 

src/preferences.py

@@ -142,14 +142,28 @@ def save_preferences(prefs_filename, prefs):
 def app_state_2_fitsheader(app, app_state, fits_header):
     prefs = Prefs()
     prefs = app_state_2_prefs(prefs, app_state, app)
+    fits_header["INTP-OPT"] = prefs["interpol_type_option"]
+    fits_header["SMOOTHING"] = prefs["smoothing_option"]
+    fits_header["SAMPLE-SIZE"] = prefs["sample_size"]
+    fits_header["RBF-KERNEL"] = prefs["RBF_kernel"]
+    fits_header["SPLINE-ORDER"] = prefs["spline_order"]
+    fits_header["CORR-TYPE"] = prefs["corr_type"]
     fits_header["BG-PTS"] = str(prefs["background_points"])
 
     return fits_header
 
 
-def fitsheader_2_app_state(app_state, fits_header):
+def fitsheader_2_app_state(app, app_state, fits_header):
     if "BG-PTS" in fits_header.keys():
         app_state["background_points"] = [np.array(p) for p in json.loads(fits_header["BG-PTS"])]
 
+    if "BG-EXTR" in fits_header.keys():
+        app.interpol_type.set(fits_header["INTP-OPT"])
+        app.smoothing_slider.set(fits_header["SMOOTHING"])
+        app.help_panel.sample_size_slider.set(fits_header["SAMPLE-SIZE"])
+        app.RBF_kernel.set(fits_header["RBF-KERNEL"])
+        app.spline_order.set(fits_header["SPLINE-ORDER"])
+        app.corr_type.set(fits_header["CORR-TYPE"])
+
     return app_state