Why are page and image dimensions different after conversion?

[jscodecode]

`
doc = fitz.open()

#1. open image as fitz.Document and convert it to a PDF in memory

imgpdf = fitz.open('1.png').convert_to_pdf()

#2. append memory PDF as a page

doc.insert_pdf(fitz.open("pdf", imgpdf))

doc.save('1.pdf')
`

image size is changed from w:{595 },h:{842}(1.png size) to w:{447},h:{632}(1.pdf size)

How can I solve this problems?

[JorjMcKie]

This is a typical "Discussions" post not an issue, therefore I will first transfer it.

[JorjMcKie]

Everything works as it should.
Look at the image's DPI, you will find an explanation there.
The page rectangle in the document is computed as fitz.Rect(0, 0, width * 72 / DPI, height * 72 / DPI), because its dimension is measured in points, where 1 inch = 72 points.
Here is an example from an image with 96 DPI. Please follow the argument by looking at the numbers in this picture:

Multiply the "print size" inch numbers with 72 and you will see which page dimension is computed by PyMuPDF - it is not 439 x 501!

If you absolutely want that, you need different code:

pix = fitz.Pixmap(imagefile)
page = doc.new_page(width=pix.width, height=pix.height)
page.insert_image(page.rect, pixmap=pix)

But please remember: the DPI are there for image quality reasons. If you ignore this as shown, the image on that page will naturally appear with a lower quality.

[jscodecode]

I have solved this problem with a higher quality by your answer. I sincerely appreciate your help.