Created Radiation, Photo classes and slimmed down main program.

- Radiation creates a list with timezone_aware datetime and radiation in µS/h.
- Photo reads DateTimeOriginal from photo.
- Photo.write_exif compiles new metadata object and writes exif tags to photo.
- Documentd changes in CHANGELOG.md.
- Changed Readme.me to match changes in code.
- Removed obsolete line from .gitignore

rad_tag.py

@@ -1,20 +1,18 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
-"""Iterates over a bunch of .jpg or .cr2 files and matches 
+''' Iterates over a bunch of .jpg or .cr2 files and matches 
 DateTimeOriginal from Exif tag to DateTime in a csv log 
 of a GeigerMuellerCounter and writes its value to the UserComment
-Exif tag in µS/h"""
+Exif tag in µS/h '''
 
-from datetime import datetime, timedelta
 import os
 import shutil
 import csv
 import argparse
 import pytz
-import pyexiv2
 import gpxpy
-from functions import Radiation
+from functions import Radiation, Photo
 
 # SIFACTOR for GQ Geiger counters
 
@@ -110,14 +108,14 @@ for src_photo in args.photos:
         else:
             photo = src_photo
 
-    # Load Exif data from image
-    metadata = pyexiv2.ImageMetadata(photo)
-    metadata.read()
-    tag = metadata['Exif.Photo.DateTimeOriginal']
-    # tag.value creates datetime object in pictime
-    pic_naive_time = tag.value
-    # Set timezone
-    pic_time = pic_naive_time.astimezone(local_timezone)
+    pic_aware_time = Photo(photo, local_timezone)
+    print(photo_basename, pic_aware_time)
+
+    # Here the matching magic has to happen
+
+    # Write exif data
+    # exif_tags = Photo.write_exif(radiation, latitude, longitude, args.dry)
+    # print(exif_tags)
 
 # Print table header
 print('{:<15} {:<25} {:<22}'.format('filename', 'date / time', 'Exif UserComment'))