Prerequisites: Python GUI – tkinter, Python: Pillow

Have you ever wondered to make a Image viewer with the help of Python? Here is a solution to making the Image viewer with the help of Python. We can do this with the help of Tkinter and pillow. We will discuss the module needed and code below.

Module Needed

Tkinter: Tkinter is library with the help of which we can make GUI(Graphical User Interface).

 pip install tkinter

Pillow: We can add photos as it is an imaging library of Python.

 pip install pillow

Now let’s code for it

Getting Started

Below Code demonstrates the basic structures, button initialization, and layout of the GUI produced

Python

# importing the tkinter module and PIL that
# is pillow module
from tkinter import *
from PIL import ImageTk, Image

# Calling the Tk (The initial constructor of tkinter)
root = Tk()

# We will make the title of our app as Image Viewer
root.title("Image Viewer")

# The geometry of the box which will be displayed
# on the screen
root.geometry("700x700")

# Adding the images using the pillow module which
# has a class ImageTk We can directly add the
# photos in the tkinter folder or we have to
# give a proper path for the images
image_no_1 = ImageTk.PhotoImage(Image.open("Sample.png"))
image_no_2 = ImageTk.PhotoImage(Image.open("sample.png"))
image_no_3 = ImageTk.PhotoImage(Image.open("Sample.png"))
image_no_4 = ImageTk.PhotoImage(Image.open("sample.png"))

# List of the images so that we traverse the list
List_images = [image_no_1, image_no_2, image_no_3, image_no_4]

label = Label(image=image_no_1)

# We have to show the box so this below line is needed
label.grid(row=1, column=0, columnspan=3)

# We will have three button back ,forward and exit
button_back = Button(root, text="Back", command=back,
                     state=DISABLED)

# root.quit for closing the app
button_exit = Button(root, text="Exit",
                     command=root.quit)

button_forward = Button(root, text="Forward",
                        command=lambda: forward(1))

# grid function is for placing the buttons in the frame
button_back.grid(row=5, column=0)
button_exit.grid(row=5, column=1)
button_forward.grid(row=5, column=2)

root.mainloop()

Forward function: This function is for adding the functionality to forward button

Python

def forward(img_no):

    # GLobal variable so that we can have
    # access and change the variable
    # whenever needed
    global label
    global button_forward
    global button_back
    global button_exit
    label.grid_forget()

    # This is for clearing the screen so that
    # our next image can pop up
    label = Label(image=List_images[img_no-1])

    # as the list starts from 0 so we are
    # subtracting one
    label.grid(row=1, column=0, columnspan=3)
    button_for = Button(root, text="forward",
                        command=lambda: forward(img_no+1))

    # img_no+1 as we want the next image to pop up
    if img_no == 4:
        button_forward = Button(root, text="Forward",
                                state=DISABLED)

    # img_no-1 as we want previous image when we click
    # back button
    button_back = Button(root, text="Back",
                         command=lambda: back(img_no-1))

    # Placing the button in new grid
    button_back.grid(row=5, column=0)
    button_exit.grid(row=5, column=1)
    button_for.grid(row=5, column=2)

Backward Function: This function is for adding the functionality to backward button

Python

# importing the tkinter module and PIL
# that is pillow module
from tkinter import *
from PIL import ImageTk, Image

def forward(img_no):
    global label
    global button_forward
    global button_back
    global button_exit
    label.grid_forget()

    label = Label(image=List_images[img_no-1])
    label.grid(row=1, column=0, columnspan=3)
    button_forward = Button(root, text="forward",
                        command=lambda: forward(img_no+1))

    if img_no == 4:
        button_forward = Button(root, text="Forward",
                                state=DISABLED)

    button_back = Button(root, text="Back",
                         command=lambda: back(img_no-1))

    button_back.grid(row=5, column=0)
    button_exit.grid(row=5, column=1)
    button_forward.grid(row=5, column=2)

def back(img_no):
    global label
    global button_forward
    global button_back
    global button_exit
    label.grid_forget()

    label = Label(image=List_images[img_no - 1])
    label.grid(row=1, column=0, columnspan=3)
    button_forward = Button(root, text="forward",
                            command=lambda: forward(img_no + 1))
    button_back = Button(root, text="Back",
                         command=lambda: back(img_no - 1))

    if img_no == 1:
        button_back = Button(root, text="Back", state=DISABLED)

    label.grid(row=1, column=0, columnspan=3)
    button_back.grid(row=5, column=0)
    button_exit.grid(row=5, column=1)
    button_forward.grid(row=5, column=2)

root = Tk()
root.title("Image Viewer")
root.geometry("700x700")

# Change the png file name a/c to your image 
image_no_1 = ImageTk.PhotoImage(Image.open("Sample.png"))
image_no_2 = ImageTk.PhotoImage(Image.open("Capture3.png"))
image_no_3 = ImageTk.PhotoImage(Image.open("Sample2.png"))
image_no_4 = ImageTk.PhotoImage(Image.open("Sample4.png"))

List_images = [image_no_1, image_no_2, image_no_3, image_no_4]

label = Label(image=image_no_1)
label.grid(row=1, column=0, columnspan=3)

button_back = Button(root, text="Back", command=back,
                     state=DISABLED)

button_exit = Button(root, text="Exit",
                     command=root.quit)

button_forward = Button(root, text="Forward",
                        command=lambda: forward(1))

button_back.grid(row=5, column=0)
button_exit.grid(row=5, column=1)
button_forward.grid(row=5, column=2)

root.mainloop()

Complete Code

Images Used and their order –

Order in which the images will be shown.

Python

# importing the tkinter module and PIL
# that is pillow module
from tkinter import *
from PIL import ImageTk, Image

def forward(img_no):
    global label
    global button_forward
    global button_back
    global button_exit
    label.grid_forget()

    label = Label(image=List_images[img_no-1])
    label.grid(row=1, column=0, columnspan=3)
    button_forward = Button(root, text="forward",
                        command=lambda: forward(img_no+1))

    if img_no == 4:
        button_forward = Button(root, text="Forward",
                                state=DISABLED)

    button_back = Button(root, text="Back",
                         command=lambda: back(img_no-1))

    button_back.grid(row=5, column=0)
    button_exit.grid(row=5, column=1)
    button_forward.grid(row=5, column=2)

def back(img_no):
    global label
    global button_forward
    global button_back
    global button_exit
    label.grid_forget()

    label = Label(image=List_images[img_no - 1])
    label.grid(row=1, column=0, columnspan=3)
    button_forward = Button(root, text="forward",
                            command=lambda: forward(img_no + 1))
    button_back = Button(root, text="Back",
                         command=lambda: back(img_no - 1))

    if img_no == 1:
        button_back = Button(root, text="Back", state=DISABLED)

    label.grid(row=1, column=0, columnspan=3)
    button_back.grid(row=5, column=0)
    button_exit.grid(row=5, column=1)
    button_forward.grid(row=5, column=2)

root = Tk()
root.title("Image Viewer")
root.geometry("700x700")

image_no_1 = ImageTk.PhotoImage(Image.open("Sample.png"))
image_no_2 = ImageTk.PhotoImage(Image.open("sample.png"))
image_no_3 = ImageTk.PhotoImage(Image.open("Sample.png"))
image_no_4 = ImageTk.PhotoImage(Image.open("sample.png"))

List_images = [image_no_1, image_no_2, image_no_3, image_no_4]

label = Label(image=image_no_1)
label.grid(row=1, column=0, columnspan=3)

button_back = Button(root, text="Back", command=back,
                     state=DISABLED)

button_exit = Button(root, text="Exit",
                     command=root.quit)

button_forward = Button(root, text="Forward",
                        command=lambda: forward(1))

button_back.grid(row=5, column=0)
button_exit.grid(row=5, column=1)
button_forward.grid(row=5, column=2)

root.mainloop()

Output:

Image Viewer App in Python using Tkinter

Module Needed

Getting Started

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