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Python

from pdfrw import PdfReader
from PIL import Image
import os
from time import sleep
from pdf2image import convert_from_path
import cv2
import numpy as np
from PyPDF2 import PdfFileReader, PdfFileWriter
pdf = PdfReader('target.pdf')
measures = pdf.pages[0].MediaBox
basenumberwidth, ext1 = os.path.splitext(measures[2])
basenumberheight, ext2 = os.path.splitext(measures[3])
basewidth = int(basenumberwidth)
baseheight = int(basenumberheight)
print(basewidth)
print(baseheight)
fileName = ("out.pdf")
pdfFile = PdfFileReader(open(fileName, 'rb'))
# Getting only first page!
newPage = pdfFile.getPage(0)
newHeight = baseheight
newWidth = basewidth
newPage.scaleTo(newWidth, newHeight)
writer = PdfFileWriter()
writer.addPage(newPage)
with open('cover.pdf', 'wb') as f:
writer.write(f)