How to copy annotations from one page to another and resize the pdf when needed

[evansavage]

Hello, I am building a resize_pdf_pages function in python, and I have reliably been able to get the desired output, which is standardizing pages to 8.5" X 11" format. Page.show_pdf_page() made this very easy, but I am losing all annotations in the process, as this method does not preserve them. How do I both resize the pages and preserve the annotations?

I want the input and output documents to be "the same", other than resizing where needed. In the event of a page being too large, I would like the annotations to scale down with the original page, keeping their relative position to the input page. In the event of a page being too small, I do not scale the page up at all, I post it to the center of a standard 8.5" x 11" page. I would like to preserve the annotation positions relative to the original page size in this case.

Here is my current function:

def resize_pdf_pages(file_field, output_width=612, output_height=792):
    file_bytes = file_field.read()
    output_doc = fitz.open()

    with fitz.open("pdf", file_bytes) as pdf:
        for page_number in range(pdf.page_count):
            page = pdf.load_page(page_number)
            width = page.mediabox[2]
            height = page.mediabox[3]
            new_page = output_doc.new_page(width=output_width, height=output_height)

            if width == output_width and height == output_height:
                # Page dimensions already match the output size, copy the page
                new_page.show_pdf_page(new_page.rect, pdf, page_number)
            else:
                # Page needs resizing or center-justification
                if width <= output_width and height <= output_height:
                    # Page is smaller than the output size, center-justify the image
                    new_page.show_pdf_page(
                        fitz.Rect(
                            (output_width - width) / 2,
                            (output_height - height) / 2,
                            (width + output_width) / 2,
                            (height + output_height) / 2
                        ),
                        pdf, page_number, keep_proportion=True
                    )

                else:
                    # Page is larger than the output size, resize and center-justify the image
                    new_page.show_pdf_page(
                        new_page.rect,
                        pdf, page_number, keep_proportion=True
                    )

    return BytesIO(output_doc.write())

[JorjMcKie]

Let me transfer to Discussions first ...