Render one page of a PDF to a PNG buffer at the given DPI. Opens and
closes the document itself — for more than one page from the same PDF, use openPdfForRender + renderLoadedPage instead.
Parameters
pdfPath: string
path to the PDF file
pageNum: number
1-based page number
dpi: number
PDF user space is 72 units/inch, so scale = dpi / 72
Render one page of a PDF to a PNG buffer at the given DPI. Opens and closes the document itself — for more than one page from the same PDF, use
openPdfForRender+renderLoadedPageinstead.