PyMuPDF insert image at bottom - python-3.x

Question

I'm trying to read a PDF and insert an image at bottom(Footer) of each page in PDF. I've tried with PyMuPDF library.
Problem: Whatever the Rect (height, width) I give, it doesn't appear in the bottom, image keeps appearing only on the top half of the page (PDF page).
My code:
from fitz import fitz, Rect
doc = fitz.open("test_pdf2.pdf")
def add_footer(pdf):
img = open("footer4.jpg", "rb").read()
rect = Rect(0, 0, 570, 1230)
for i in range(0, pdf.pageCount):
page = pdf[i]
if not page._isWrapped:
page._wrapContents()
page.insertImage(rect, stream=img)
add_footer(doc)
doc.save('test_pdf5.pdf')
Processed_image with footer image in the middle of the page:
https://i.stack.imgur.com/HK9mm.png
Footer image:
https://i.stack.imgur.com/FRQYE.jpg
Please help!
Please let me know if this can be achieved by using any other library.

Answer 1

Some pages internally change the standard PDF geometry (which uses the bottom-left page point as (0, 0)) to something else, and at the same time do not encapsulate this doing properly as they should.
If you suspect this, use PyMuPDF methods to encapsulate the current page /Contents before you insert your items (text, images, etc.).
The easiest way is Page._wrapContents() which is also the friendly way to keep incremental PDF saves small. The MuPDF provided Page.cleanContents() does this and a lot more cleaning stuff, but bloats the incremental save delta, if this is a concern.

Answer 2

After doing little trial and error I was able to figure out the problem. I was missing out on proper dimensions of Rect, I had to give 0.85*h in second parameter.
below is the code:
from fitz import fitz, Rect
doc = fitz.open("test_pdf2.pdf")
w = 595
h = 842
def add_footer(pdf):
img = open("footer4.jpg", "rb").read()
rect = fitz.Rect(0, 0.85*h, w, h)
for i in range(0, pdf.pageCount):
page = pdf[i]
if not page._isWrapped:
page._wrapContents()
page.insertImage(rect, stream=img)
add_footer(doc)
doc.save('test_pdf5.pdf')

Answer 3

use:
wrapContents – Page.wrap_contents()
https://pymupdf.readthedocs.io/en/latest/znames.html?highlight=wrapContents
from fitz import fitz, Rect
doc = fitz.open("example.pdf")
w = 250
h = 400
def add_footer(pdf):
img = open("firmaJG.png", "rb").read()
rect = fitz.Rect(0, 0.85*h, w, h)
for i in range(0, pdf.pageCount):
page = pdf[i]
if not page._isWrapped:
page.wrap_contents()
page.insertImage(rect, stream=img)
add_footer(doc)
doc.save('test_pdf5.pdf')