Scales on the fly as window size changes. Also have the width scaling to maintain aspect ratio

main.py

@@ -19,6 +19,7 @@ class MangaReader:
         master.geometry("700x900")
         master.resizable(width=True, height=True)
 
+        
         # Menu Bar
         self.menu = Menu(master)
         item = Menu(self.menu)
@@ -49,6 +50,7 @@ class MangaReader:
         # display image
         self.panel = Label(self.master, image=self.img)
         self.panel.pack()
+        self.panel.bind('<Configure>', self.redraw)
 
     def open_menu(self):
         # file dialog. reset page counts, call display Maanga passing in starting values
@@ -78,11 +80,16 @@ class MangaReader:
             data = zip.read(fl[pg])
             im = Image.open(io.BytesIO(data))
 
+            # I found the below code to maintain image ratios at https://stackoverflow.com/questions/273946/how-do-i-resize-an-image-using-pil-and-maintain-its-aspect-ratio
+
            # wpercent = (basewidth / float(im.size[0]))
            # hsize = int((float(im.size[1]) * float(wpercent)))
 
+            #Modified above code to maintain height and scale width
+            hpercent = (hsize / float(im.size[1]))
+            widthsize = init((float(im.size[0] * float(hpercent))))
 
-            im = im.resize((wsize, hsize), Image.ANTIALIAS)
+            im = im.resize((widthsize, hsize), Image.ANTIALIAS)
             #convert to tkImage and update the on screen image.
             self.img = ImageTk.PhotoImage(im)
             self.panel.config(image=self.img)
@@ -107,7 +114,10 @@ class MangaReader:
         else:
             #reset self.page and doNothing
             self.page = self.page + 1
-
+    
+    def redraw(self, event):
+        if self.file != 'None':        
+            self.displayManga(self.file, self.page)
 
 #initalize tk
 root=Tk()