How do I export an entire notebook as an image?

Question

I am trying to export a complete notebook as a single image. I do not want separate pages, just one really long image.

I think I got close to figuring this out in the past, but I forgot what I did.

I am looking for something like how M$oft Edge's "web capture" can save an entire page to a single image file:

Answer 1

Edit, I found out how to do it, but it is not rendering the notebook style correctly for some reason

:(

Export[FileNameJoin[{NotebookDirectory[], "image.jpg"}], 
 SelectedNotebook[]]

Edit: Andrew Lewis of the Wolfram Technical Support team confirmed the bug and provided me this work-around using WebExecute (tested on WL version 14.0):

:)

(* 1. Export as html *)
exp=NotebookDirectory[];
Export[exp<>"test.html",NotebookObject[style (2).nb]];
(* 2. Open the exported .html using the web browser driver *)
session=StartWebSession["Firefox",Visible->False];
WebExecute[session,"OpenPage"->"file://"<>exp<>"test.html"];
(* 3. Use the web browser driver to take a screenshot *)
width=WebExecute[session,"JavascriptExecute"->"return document.documentElement.scrollWidth"];
height=WebExecute[session,"JavascriptExecute"->"return document.documentElement.scrollHeight"];
WebExecute[session,"SetWindowSize"->{width,height}];
webpageImage=WebExecute[session,"CapturePage"];
(* 4. Save the screenshot *)
Export[exp<>"screenshot.png",webpageImage];

Answer 2

This is easy to do on Linux. For windows or mac, you might have to use online tool. There are many of them if you google. I just tried it this on one large notebook I have.

1. open the notebook and save as PDF. Assume file is saved as A.pdf

2. open terminal and type

   convert A.pdf -append p%d.png

Done.

convert is basic Linux command that comes with Linux/Unix (if you do not have it, very easy to install).

This will create one single PNG image in same folder which contains all the PDF pages in one image.

It will be hard to see without zooming if you have many pages ofcourse.

To do the same on windows, if you have WSL then you can do the same command. As I said, there are online tools that do this also given a PDF file as input. But I do not like to use online tools.

Ofcourse the image using this, will look like the Mathematica exported PDF file and not like the the notebook itself. So some stylings might be lost.

So it depend on how good Mathematica PDF export is.

Reference: convert-multipage-pdf-to-a-single-image

https://reference.wolfram.com/language/howto/ExportToPDF.html