How to save a whole page rendered in a QtWebView as an image?

[hckr]

I need to save a page loaded in a QtWebView as an image (preferably jpg or png).
I am interested in the whole contents of a page, not just the part which is currently visible and has to be scrolled to – from top to bottom (I assume I would have to set a width).
It would be great if the method would not require to show the QtWebView widget on screen.

[Lingfa]

@hckr You can save a whole page to PDF, but not jpg nor png.

m_view->page()->printToPdf(filePath);

[hckr]

Yes, I've seen it before. But the thing is, I'd like to 1) crop a fragment of it later, 2) save it as an image.