Developed the program a bit

metadata_writer.py

@@ -1,15 +1,62 @@
+#!/bin/env python
+
+import time
 import sys
 import json
 import tkinter as tk
+import hashlib
+from time import strftime, localtime
 from tkinter import messagebox
+from tkinter import Frame
+from tkcalendar import Calendar
 from PIL import Image, ImageTk
 
+#Got TextScrollCombo from stack overflow https://stackoverflow.com/questions/13832720/how-to-attach-a-scrollbar-to-a-text-widget
+class TextScrollCombo(tk.Frame):
+
+    def __init__(self, *args, **kwargs):
+
+        super().__init__(*args, **kwargs)
+
+        # ensure a consistent GUI size
+        self.grid_propagate(False)
+        # implement stretchability
+        self.grid_rowconfigure(0, weight=1)
+        self.grid_columnconfigure(0, weight=1)
+
+        # create a Text widget
+        self.txt = tk.Text(self,height=10)
+        self.txt.grid(row=0, column=0, sticky="nsew", padx=2, pady=2)
+
+        # create a Scrollbar and associate it with txt
+        scrollb = tk.Scrollbar(self, command=self.txt.yview)
+        scrollb.grid(row=0, column=1, sticky='nsew')
+        self.txt['yscrollcommand'] = scrollb.set
+    def get(c,a,b):
+        return c.txt.get(a,b)
+
+#Got md5Checksum from someones blog https://www.joelverhagen.com/blog/2011/02/md5-hash-of-file-in-python/
+def md5Checksum(filePath):
+    with open(filePath, 'rb') as fh:
+        m = hashlib.md5()
+        while True:
+            data = fh.read(8192)
+            if not data:
+                break
+            m.update(data)
+        return m.hexdigest()
+
 def main(image_path):
+
     def save_and_exit():
         title = title_entry.get()
-        description = description_entry.get()
+        description = description_entry.get("1.0",'end-1c')
         data = {
+            "version": "v0.0-dev",
             "title": title,
+            "capture_time_start": int(time.mktime(time.strptime(timestamp_start.get(), '%Y-%m-%d %H:%M:%S'))),
+            "capture_time_end": int(time.mktime(time.strptime(timestamp_end.get(), '%Y-%m-%d %H:%M:%S'))),
+            "image_md5": md5Checksum(image_path),
             "description": description
         }
 
@@ -20,7 +67,7 @@ def main(image_path):
 
     # GUI setup
     root = tk.Tk()
-    root.title("Image Metadata Entry")
+    root.title("Metadata Writer")
 
     # Load and display image
     img = Image.open(image_path)
@@ -29,20 +76,44 @@ def main(image_path):
 
     img_label = tk.Label(root, image=photo)
     img_label.image = photo  # keep a reference
-    img_label.pack(pady=10)
+
+
+    time_start=1347517370
+    time_end=1547517370
+
+    timestamp=Frame(root)
+    start_var = tk.StringVar(value=strftime('%Y-%m-%d %H:%M:%S', localtime(time_start)))
+    end_var = tk.StringVar(value=strftime('%Y-%m-%d %H:%M:%S', localtime(time_end)))
+    timestamp_start = tk.Entry(timestamp,textvariable=start_var)
+    timestamp_end = tk.Entry(timestamp,textvariable=end_var)
+    tk.Label(timestamp, text="Shot time/date start:").grid(row=0,column=0)
+    tk.Label(timestamp, text="Shot time/date end:").grid(row=0,column=2)
+    timestamp_start.grid(row=0,column=1)
+    timestamp_end.grid(row=0,column=3)
 
     # Input fields
-    tk.Label(root, text="Title:").pack()
-    title_entry = tk.Entry(root, width=50)
-    title_entry.pack(pady=5)
+    title_frame=Frame(root)
+    title_entry = tk.Entry(title_frame)
+    tk.Label(title_frame, text="Title:").pack(side=tk.LEFT)
+    title_entry.pack(fill=tk.X)
 
-    tk.Label(root, text="Description:").pack()
-    description_entry = tk.Entry(root, width=50)
-    description_entry.pack(pady=5)
+    description=Frame(root)
+    tk.Label(description, text="Description:").pack(side=tk.LEFT)
+    description_entry = TextScrollCombo(description,height=10)
+    description_entry.pack()
+
+    description_entry.config(width=600, height=100)
 
     # Save button
     save_button = tk.Button(root, text="Save and Exit", command=save_and_exit)
-    save_button.pack(pady=10)
+
+
+    img_label                          .grid(row=0,column=0,rowspan=5,sticky='n')
+    title_frame                        .grid(row=0,column=1,sticky="we")
+    description                        .grid(row=2,column=1,sticky="we")
+    timestamp                          .grid(row=3,column=1,sticky="we")
+    save_button                        .grid(row=4,column=1)
+
 
     root.mainloop()
 

output.json

@@ -0,0 +1,8 @@
+{
+    "version": "v0.0-dev",
+    "title": "a",
+    "capture_time_start": 1347517370,
+    "capture_time_end": 1547517370,
+    "image_md5": "662eeeb1b3d31e4615f4c5bc3f19e3d7",
+    "description": "bb\ncc"
+}