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[python] PyMuPDF 에서 해상도 올리기. PDF to IMG

How to Increase Image Resolution

https://pymupdf.readthedocs.io/en/latest/recipes-images.html

The image of a document page is represented by a Pixmap, and the simplest way to create a pixmap is via method Page.get_pixmap().

This method has many options to influence the result. The most important among them is the Matrix, which lets you zoom, rotate, distort or mirror the outcome.

Page.get_pixmap() by default will use the Identity matrix, which does nothing.

In the following, we apply a zoom factor of 2 to each dimension, which will generate an image with a four times better resolution for us (and also about 4 times the size):

zoom_x = 2.0  # horizontal zoom
zoom_y = 2.0  # vertical zoom
mat = fitz.Matrix(zoom_x, zoom_y)  # zoom factor 2 in each dimension
pix = page.get_pixmap(matrix=mat)  # use 'mat' instead of the identity matrix

dpi = 600
pix = page.get_pixmap(dpi)

Since version 1.19.2 there is a more direct way to set the resolution: Parameter "dpi" (dots per inch) can be used in place of "matrix". To create a 300 dpi image of a page specify pix = page.get_pixmap(dpi=300). Apart from notation brevity, this approach has the additional advantage that the dpi value is saved with the image file – which does not happen automatically when using the Matrix notation.

PyMuPDF is a high performance Python library for data extraction, analysis, conversion & manipulation of PDF (and other) documents.

https://pypi.org/project/PyMuPDF/

>> pip install PyMuPDF

1.디렉토리 안의 pdf 파일을 읽어들여서 리스트 목록을 출력

2.파일명을 넘기면 파일명_이미지순서.png 파일을 생성. 

import fitz  # PyMuPDF

 
# 파이썬 컴파일 경로가 달라서 현재 폴더의 이미지를 호출하지 못할때 작업디렉토리를 변경한다. 
import os
from pathlib import Path
# src 상위 폴더를 실행폴더로 지정하려고 한다.
###real_path = Path(__file__).parent.parent
real_path = Path(__file__).parent
print(real_path)
#작업 디렉토리 변경
os.chdir(real_path) 

directory_base = str(real_path)+"./ONE/"  # 경로object를 문자열로 변경해서 합친다. 
 


def pdf_to_png(pdf_file, input_pdf_name, output_folder):
    # Open the PDF file
    pdf_document = fitz.open(pdf_file)
    
    for page_number in range(pdf_document.page_count):
        # Get the page
        page = pdf_document[page_number]
        
        # Convert the page to an image
        image = page.get_pixmap()
        
        # Save the image as a PNG file
        image.save(f"{output_folder}/{input_pdf_name}_{page_number + 1}.png", "png")

    # Close the PDF file
    pdf_document.close()

if __name__ == "__main__":
     
    # List all files in the directory
    file_list = [f for f in os.listdir(directory_base) if os.path.isfile(os.path.join(directory_base, f))]

    # Print the list of files
    for file in file_list:
        print(file)
        
        #input_pdf = "./TWO/"+ file_name +".pdf"  # Replace with your PDF file path
        input_pdf      = "./ONE/"+ file  # Replace with your PDF file path
        input_pdf_name = os.path.splitext(file)[0]
        print(input_pdf_name)
        output_folder  = "./ONE/data"  # Replace with your output folder
        
        pdf_to_png(input_pdf, input_pdf_name, output_folder)