imbernoulli/pdf-color-inverter

PDF Color Inverter is a simple yet powerful tool that helps to convert PDF files with dark backgrounds to a lighter scheme (also can from light to dark, it is decided by the file's original scheme).

PDF Color Inverter

PDF Color Inverter is a simple yet powerful tool that helps to convert PDF files with dark backgrounds to a lighter scheme (also can from light to dark, it is decided by the file's original scheme), making them more suitable for printing. It utilizes PyMuPDF, PIL, and FPDF libraries to process PDFs and invert the colors for an optimized print-friendly version.

Steps

• Convert PDF pages to images
• Invert colors of each image
• Reassemble images back into a single PDF

Installation

To use PDF Color Inverter, you need to have Python installed on your machine along with the following dependencies:

• PyMuPDF
• Pillow
• FPDF

You can install these packages using pip:

pip install PyMuPDF Pillow fpdf

Usage

Using PDF Color Inverter is simple. Import the main function from the script and provide it with the input and output PDF paths:

from pdf_color_inverter import main

input_pdf_path = 'path_to_your_input.pdf'
output_pdf_path = 'path_to_your_output.pdf'
main(input_pdf_path, output_pdf_path)

Or you can just modify the paths in pdf_color_inverter and run it.

You can adjust dpi in pdf_to_images(pdf_path, dpi=300) and quality in img.save(temp_img_file.name, format='JPEG', quality=95) to adjust the quality of the output. Output with better quality will take longer to process.

How It Works

1. Converting PDF to Images: The pdf_to_images function opens a PDF and converts each page into an image at a specified DPI.
2. Inverting Image Colors: The invert_colors function takes the list of images and inverts their colors to a negative.
3. Saving Images to PDF: The save_images_to_pdf function takes the inverted images and saves them back into a single PDF document.