Using shotwell to label images

I needed to label a lot of images into 4 classes. Using the ratings of shotwell this can be really fast.

Pressing 1 to 5 to set a rating on an image.

shotwell

The next step was to get the ratings for later use as labels in machine learning.

Because shotwell stores its data in a sqlite database we only need some lines of Python to get the labels:

import csv
import os.path
import sqlite3
import sys

# location of shotwell sqlite file
db_file = os.path.join(os.environ.get("HOME"), '.local/share/shotwell', 'data', 'photo.db')
conn = sqlite3.connect(db_file)
c = conn.cursor()
rows = c.execute('SELECT filename, rating FROM phototable WHERE rating > 0 ORDER BY filename;')
csvwriter = csv.writer(sys.stdout, delimiter=';')
csvwriter.writerow(["filename", "rating"])
for (filename, rating) in rows:
    csvwriter.writerow([os.path.basename(filename), rating])

Only the ratings bigger than 0 are selected. The CSV is written to stdout by default.

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