Font size does not change in PDF output

[raptistasos]

Hi,

I am trying to change the font size of the PDF output (using the xelatex engine) via the sphinx: config: latex_elements: pointsize: value in the _confing.yml but no effect is observed. Do you have any idea about it?

The corresponding part in _confing.yml looks like this,

sphinx:
  config:
    latex_elements:
      papersize             : a4paper #(tried lettepaper as well)
      pointsize             : 12pt #(tried 10-16pt)
      fncychap              : \usepackage[Glenn]{fncychap}
      babel                 : "\\usepackage{polyglossia}\n\\setmainlanguage{greek}\n\\setotherlanguage{english}"
      fontpkg               : "\\setmainfont[Script=Greek]{GFS Artemisia} \n\\setsansfont[Script=Greek]{GFS Neohellenic}

Thanks!

> jupyter book --version
Jupyter Book      : 0.12.1
External ToC      : 0.2.3
MyST-Parser       : 0.15.2
MyST-NB           : 0.13.1
Sphinx Book Theme : 0.1.6
Jupyter-Cache     : 0.4.1
NbClient          : 0.5.3

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[krishpn]

Thanks @raptistasos for bringing this up, I have similar issue including line spacing

[florianbussmann]

Hello, I had the same problem with pointsize and other class options. I solved these issues and proposed a fix in this PR https://github.com/executablebooks/sphinx-jupyterbook-latex/pull/92 last month, unfortunately it hasn't been reviewed so far. But you should be able to solve the issue with the updated jupyterBook.cls from the PR as a workaround or you can also use my jupyter-book setup from this repo https://github.com/florianbussmann/scientific-reports-with-jupyter

I hope the instructions from the PR are helpful, otherwise feel free to ask questions!

[mmcky]

thanks @raptistasos for opening this issue. Thanks @florianbussmann for the PR. I see @AakashGfude is now reviewing that.

[AakashGfude]

https://github.com/executablebooks/sphinx-jupyterbook-latex/pull/92 has been merged now. Thanks, @florianbussmann for the change. Will be available in the next sphinx-jupyterbook-latex release.

[michaelosthege]

After updating to sphinx-jupyterbook-latex==0.4.7 the pointsize setting from my _config.yml still does not have an effect on the resulting PDF.

Jupyter Book      : 0.13.1
External ToC      : 0.2.4 
MyST-Parser       : 0.15.2
MyST-NB           : 0.13.2
Sphinx Book Theme : 0.3.2 
Jupyter-Cache     : 0.4.3 
NbClient          : 0.5.13

The relevant parts of my configuration are:

_config.yml

sphinx:
  config:
    latex_elements: 
      papersize: "a4paper"
      pointsize: 18pt
latex:
  latex_engine: "xelatex"

_toc.yml

format: jb-book
root: index
chapters:
- file: 0_Prefix/index.md
- file: 1_Introduction/index.md

I don't have a custom jupyterBook.cls like @florianbussmann had, but just the jupyter-book default.

Do I need this custom jupyterBook.cls theme, or did I miss something else?

Related to font sizes, I'm still looking for a way to change the code-block fontsize (https://github.com/orgs/executablebooks/discussions/730).

[michaelosthege]

@AakashGfude @mmcky @chrisjsewell sorry to tag you, but I'm under time pressure and pretty much lost with debugging why pointsize has no effect on the generated PDF 😕

The pointsize setting (as shown above) ends up in the generated LaTeX in line 3 \documentclass[a4paper,18pt,english]{jupyterBook} but this has no effect on the resulting PDF.

I tried several ways to change the font size but none of them were successful. At this point I simply don't understand which package/setting determines the de-facto fontsize of the result.

If anybody could give me some pointers that would be great! I'll gladly contribute this information to the docs or submit a PR to bugfix something :)

[AakashGfude]

Hi @michaelosthege, by default latex does not support 18pt. Only 10pt, 11pt, 12pt from what I have seen. Also, mentioned in this comment https://github.com/executablebooks/sphinx-jupyterbook-latex/pull/92#issuecomment-1086989622 . There are some packages which can extend this range as given in https://texblog.org/2012/08/29/changing-the-font-size-in-latex/. Do you want higher ranges for your project?

[michaelosthege]

Thank you @AakashGfude!! Looks like I expected too much of LaTeX.. For my thesis I think 12pt will be good enough.

Next I'll try to reduce the size of code blocks (as we discussed a few months back).

[IamShubhamGupto]

Hey Is there a way to adjust the font size of the title of the Jupyter book?

For example on https://m2lines.github.io/L96_demo/intro.html

I want the text Learning Machine Learning with Lorenz-9 on the navbar to be slightly bigger as there is a lot of text and want it to be significant enough to be seen as the title

[psychemedia]

I'm trying to use the fontsize 12pt but am not seeing any change when generating the output PDF.

Is this still an open issue?