Notebook 03 — DNB Cover Images

Project: Linked Open Exhibition — NFDI4Culture / Hochschule Hannover (BIM-126-02)
AI attribution: GitHub Copilot (Claude Sonnet 4.6)
Depends on: 02_dnb_filter_exhibitions.ipynb — run that first to produce sprengel_exhibitions.csv

Purpose: Retrieve cover images from the DNB catalogue enrichment API for each exhibition record that has an ISBN.

---

Important: image rights disclaimer

Cover images retrieved via the DNB catalogue enrichment API are supplied by publishers and are not covered by the CC0 licence that applies to DNB bibliographic metadata.
These images are fetched here for temporary, local, educational use only (to accompany Wikibase uploads) and must not be committed to this repository or redistributed.
The catalogues/images/ directory is listed in .gitignore.
Always verify image rights before any public reuse.

DNB cover image URL pattern:

https://portal.dnb.de/opac/mvb/cover?isbn={ISBN}

import requests
import pandas as pd
import time
from pathlib import Path

CSV_PATH  = Path("../sprengel_exhibitions.csv")
IMAGE_DIR = Path("../images")
IMAGE_DIR.mkdir(parents=True, exist_ok=True)

COVER_URL = "https://portal.dnb.de/opac/mvb/cover"

# Read all columns as strings to prevent ISBNs being parsed as floats
df = pd.read_csv(CSV_PATH, dtype=str).fillna("")

with_isbn = df[df["isbn"].str.strip() != ""]
print(f"Records loaded   : {len(df)}")
print(f"Records with ISBN: {len(with_isbn)}")
print(f"\nSample ISBNs:")
print(with_isbn["isbn"].head(5).to_string())

Records loaded   : 582
Records with ISBN: 452

Sample ISBNs:
0    9783775758642
1    9783775758659
2    9783791376226
3    9783864424571
4    9783949924101

Step 1 — Download cover images

import re

def clean_isbn(raw):
    """Extract digits and X from ISBN string."""
    return re.sub(r"[^0-9X]", "", str(raw).upper())

downloaded = 0
skipped    = 0

for _, row in df.iterrows():
    idn  = str(row["idn"]).strip()
    isbn = clean_isbn(row.get("isbn", ""))

    if not isbn:
        skipped += 1
        continue

    out_path = IMAGE_DIR / f"{idn}.jpg"
    if out_path.exists():
        print(f"  Already exists: {out_path.name}")
        downloaded += 1
        continue

    try:
        resp = requests.get(COVER_URL, params={"isbn": isbn}, timeout=15)
        if resp.status_code == 200 and resp.headers.get("Content-Type", "").startswith("image"):
            out_path.write_bytes(resp.content)
            print(f"  Downloaded: {out_path.name} (ISBN {isbn})")
            downloaded += 1
        else:
            print(f"  No image: IDN {idn} (HTTP {resp.status_code})")
    except requests.RequestException as e:
        print(f"  Error for IDN {idn}: {e}")

    time.sleep(0.5)  # be polite

print(f"\nDownloaded : {downloaded}")
print(f"Skipped (no ISBN): {skipped}")
print(f"Images saved to: {IMAGE_DIR.resolve()}")

  Downloaded: 1375818457.jpg (ISBN 9783775758642)
  Downloaded: 1375817957.jpg (ISBN 9783775758659)
  Downloaded: 1347131019.jpg (ISBN 9783791376226)
  Downloaded: 1357144318.jpg (ISBN 9783864424571)
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  No image: IDN 921309686 (HTTP 404)
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  No image: IDN 880653817 (HTTP 404)
  No image: IDN 880528133 (HTTP 404)
  No image: IDN 890009791 (HTTP 404)
  Downloaded: 880469838.jpg (ISBN 9783596239139)
  No image: IDN 880450177 (HTTP 404)
  No image: IDN 890331936 (HTTP 404)
  No image: IDN 890753849 (HTTP 404)
  No image: IDN 979618398 (HTTP 400)
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  No image: IDN 871092719 (HTTP 404)
  No image: IDN 850901650 (HTTP 404)
  No image: IDN 551812354 (HTTP 404)
  Downloaded: 95529097X.jpg (ISBN 9783893228836)
  Downloaded: 950703486.jpg (ISBN 9783893228836)
  Downloaded: 955299675.jpg (ISBN 9783893228836)
  No image: IDN 551505893 (HTTP 404)
  Downloaded: 970155913.jpg (ISBN 9783891691854)
  No image: IDN 95618023X (HTTP 404)

Downloaded : 205
Skipped (no ISBN): 130
Images saved to: C:\git\linked-open-exhibition\catalogues\images

Step 2 — Preview downloaded images

Display a sample of downloaded covers as a quick visual check.

from IPython.display import display, Image as IPImage

image_files = sorted(IMAGE_DIR.glob("*.jpg"))[:6]  # show up to 6

if not image_files:
    print("No images found. Check that ISBNs are present in the CSV.")
else:
    for img_path in image_files:
        print(img_path.name)
        display(IPImage(filename=str(img_path), width=120))

1000881008.jpg

1001547179.jpg

1002017270.jpg

1003246532.jpg

1003832091.jpg

1005908567.jpg

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Next step: Run 04_wikibase_data_model.ipynb to define and upload the exhibition data model to Wikibase.