Product image processor

/as:product-image-processor — Product Image Processor

Read product image records from the nearest project's product-library.csv, download them, normalize sizing, and remove backgrounds. Saves output at each processing stage without mutating the library.

Read ../../schema/product-schema.md and ../../schema/csv-conventions.md. Resolve the nearest ancestor containing PROJECT.md, strictly validate its product-library.csv, and address fields by the exact names Image URL and Product Name, never by position or letters.

Step 1: Get Input

If no arguments are provided, use the nearest project's product-library.csv and ask only for the output location when it cannot be inferred. Suggest ./product-images-YYYY-MM-DD/.

Step 2: Read URLs from CSV

Run python3 "${CLAUDE_PLUGIN_ROOT}/skills/master-schedule/scripts/csv-library.py" validate product --project <project-root> before reading. Parse the entire UTF-8 CSV strictly and select the named Image URL and Product Name fields.

Build a list of { index, url, name } entries. Skip empty rows.

Step 3: Create Output Folders

Create the output directory at the user's chosen path with 3 subfolders:

<output-path>/
├── originals/     # Raw downloads
├── resized/       # Normalized sizing
└── nobg/          # Background removed

If the folder already exists, append a suffix: -2, -3, etc.

Step 4: Download Images

Download each image using curl in Bash:

curl -L -o "<output-path>" "<url>"

IMPORTANT: Use curl, NOT WebFetch. WebFetch processes content through an AI model which corrupts binary image data.

Name files as: 001-product-name.png, 002-product-name.png, etc.

• Slugify the product name: lowercase, replace spaces/special chars with hyphens, strip consecutive hyphens
• If no name column, extract a name from the URL filename (strip extension and query params)
• If the URL gives no usable name, use 001-image.png, 002-image.png, etc.

If the downloaded file is not a PNG (check extension or content type), convert it to PNG during the resize step.

Step 5: Resize Images

Run a Python script to resize all images in originals/ → resized/:

from PIL import Image
import os, sys

input_dir = sys.argv[1]   # originals/
output_dir = sys.argv[2]  # resized/
max_edge = int(sys.argv[3]) if len(sys.argv) > 3 else 2000

for fname in sorted(os.listdir(input_dir)):
    if not fname.lower().endswith(('.png', '.jpg', '.jpeg', '.webp', '.gif', '.bmp', '.tiff')):
        continue
    try:
        img = Image.open(os.path.join(input_dir, fname))
        img = img.convert("RGBA")
        w, h = img.size
        longest = max(w, h)
        if longest > max_edge:
            scale = max_edge / longest
            new_w, new_h = int(w * scale), int(h * scale)
            img = img.resize((new_w, new_h), Image.LANCZOS)
        out_name = os.path.splitext(fname)[0] + ".png"
        img.save(os.path.join(output_dir, out_name), "PNG")
        print(f"OK: {fname} → {out_name} ({img.size[0]}x{img.size[1]})")
    except Exception as e:
        print(f"FAIL: {fname} — {e}")

Rules:

• Max 2000px on the longest edge (configurable if user requests)
• Preserve aspect ratio
• Do NOT upscale — if already smaller than max, keep original dimensions
• Convert everything to PNG (RGBA mode for transparency support)

Step 6: Remove Backgrounds

Check if rembg is installed. If not, install it:

pip3 install rembg onnxruntime

Then run background removal on all resized images → nobg/:

from rembg import remove
from PIL import Image
import os, sys, io

input_dir = sys.argv[1]   # resized/
output_dir = sys.argv[2]  # nobg/

for fname in sorted(os.listdir(input_dir)):
    if not fname.lower().endswith('.png'):
        continue
    try:
        input_path = os.path.join(input_dir, fname)
        with open(input_path, 'rb') as f:
            input_data = f.read()
        output_data = remove(input_data)
        img = Image.open(io.BytesIO(output_data))
        img.save(os.path.join(output_dir, fname), "PNG")
        print(f"OK: {fname}")
    except Exception as e:
        print(f"FAIL: {fname} — {e}")

Note: The first run of rembg downloads the u2net model (~170MB). Warn the user this may take a minute.

Step 7: Report Results

After processing, print a summary:

## Product Image Processing Complete

📁 Output: ./product-images-YYYY-MM-DD/

| Stage        | Success | Failed |
|-------------|---------|--------|
| Downloaded  | 12      | 1      |
| Resized     | 12      | 0      |
| BG Removed  | 12      | 0      |

### Failures
- 003-chair-arm.png: Download failed (404 Not Found)

Include the full path to the output folder so the user can open it.

Error Handling

• Download failures: Log and continue. Don't block the pipeline for one bad URL.
• Resize failures: Log and continue. Skip that image in the bg-removal step.
• rembg failures: Log and continue. Some images (vectors, icons) may not process well.
• CSV validation errors: Stop and report. Leave the source byte-for-byte unchanged.

Notes

• Process images sequentially (not parallel) to avoid overwhelming the network or CPU
• For large batches (50+ images), print progress every 10 images
• The rembg model download only happens once — subsequent runs reuse the cached model