JpegtoPDF (Price List Impaginator)

JpegtoPDF ("Price List Impaginator") is a local web application designed to automate the conversion of JPEG spreads (double pages) into print-ready PDFs (single A4 pages).

It is particularly suitable for laying out price lists, catalogs, or magazines starting from scans or double-page exports, automatically handling cutting, bleed, and PDF optimization.

✨ Key Features

• Automatic Spread Splitting: Takes a two-page image (spread) and automatically splits it into two single A4 pages.
• Bleed Management: Option to generate pages with 3mm bleed on all sides.
  • Smart Logic: For the binding side (spine), the software "steals" 3mm from the adjacent page of the spread to ensure graphical continuity.
• Manual Adjustments:
  • Zoom: Scale the image if necessary.
  • Offset: Shift the cut point left or right to center asymmetrical content.
• PDF Compression: Slider to adjust PDF quality and reduce final file size.
• Color Support: Preserves the original color profile (e.g., CMYK) to ensure print fidelity.
• Intuitive Interface: Drag & drop files, real-time preview, and manual page reordering.

🚀 Installation and Usage

Prerequisites

• Python 3.8 or higher installed.

Setup (First Run)

1. Clone or download this repository.
2. Run the automatic startup script (Windows):

   run_app.bat

   The script will automatically create a virtual environment (venv), install the necessary dependencies, and start the application.

Manual Startup

If you prefer to do everything manually:

1. Create an environment: python -m venv venv
2. Activate it: venv\Scripts\activate
3. Install packages: pip install -r requirements.txt
4. Start the server: python backend/main.py
5. Open browser at: http://localhost:8000

📖 How to Use

1. Upload: Drag & drop your JPEG images (spreads) into the upload area.
2. Adjust:
   • Use the Zoom and Offset sliders if the image is not perfectly centered.
   • Check Bleed (3mm) if you need to send the file to a print shop. Click Update Preview to see the effect.
3. Sort: Drag pages in the preview area to change the order if needed (e.g., cover at the beginning).
4. Generate: Adjust quality (default 100%) and click Generate PDF. The file will be downloaded automatically.

🛠 Technologies

• Backend: Python, FastAPI
• Image Processing: Pillow (PIL), img2pdf
• Frontend: HTML5, CSS3, Vanilla JS