image_viewer_sg.py

import pathlib
import PySimpleGUI as sg
from PIL import Image, ImageTk

supported_image_types = [".png", ".jpg", "jpeg", ".tiff", ".bmp"]

elements = [
    [sg.Image(key="-IMAGE-")],
    [
        sg.Text("Image Folder"),
        sg.In(size=(25, 1), enable_events=True, key="-FILE-"),
        sg.FileBrowse(),
    ]
]

layout = [[sg.Column(elements)]]

window = sg.Window("Image Viewer", layout)

while True:
    event, values = window.read()
    if event == "Exit" or event == sg.WIN_CLOSED:
        break
    if event == "-FILE-":
        path = pathlib.Path(values["-FILE-"])
        print(path.absolute())
        ext = path.suffix
        if ext.lower() in supported_image_types:
            img = Image.open(path.absolute())
            img.thumbnail((1200, 600))
            photo_img = ImageTk.PhotoImage(img)
            window["-IMAGE-"].update(data=photo_img)

window.close()