# Function to load the next image into the Label
def next_img():
    img_label.img = tk.PhotoImage(file=next(imgs))
    img_label.config(image=img_label.img)

# Function to load the next image into the Label
def previous_img():
    img_label.img = tk.PhotoImage(file=back(imgs))
    img_label.config(image=img_label.img)

def sel():
   selection = "Value = " + str(var.get())
   label.config(text = selection)
   print(img_label.img, selection)

root = tk.Tk()
var = tk.DoubleVar()
scale = tk.Scale(root, variable = var, orient='horizontal', from_=1, to=10)
scale.pack(anchor='center')
button = tk.Button(root, text="Confirm", command=sel)
button.pack(anchor='center')
label = tk.Label(root)
label.pack()

# Choose multiple images
img_dir = filedialog.askdirectory(parent=root, initialdir="D:/Temp/", title='Choose folder')
os.chdir(img_dir)
imgs = iter(os.listdir(img_dir))

img_label = tk.Label(root)
img_label.pack()
#img_label.bind("<Button-1>",save_coords)

btn_next = tk.Button(root, text='Next image', command=next_img, anchor=tk.SE)
btn_previous = tk.Button(root, text='Previous image', command=previous_img, anchor=tk.SW)
btn_next.pack()
btn_previous.pack()

next_img() # load first image

root.mainloop()