How to get math font larger than Huge in node？

Question

I need to add text to a pdf, but the largest \Huge is not big enough, so I change the font size according to question's answer, but I found that this command does not work for math fonts. You can see that only the text is successful. , and I need a command that works on mathematical symbols

\documentclass[border=2pt,tikz]{standalone}
\usepackage{tikz}
\usepackage{amsmath}
\usepackage{siunitx} 
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\node[draw=none,fill=none] at (0,0){\includegraphics{one-inc.pdf}};
\node[font=\fontsize{80}{200}\selectfont] at (25cm,3.5cm) {K};%
\node[font=\fontsize{80}{200}\selectfont] at (24cm,3.5cm) {$K_x$};%
\node[font=\fontsize{80}{200}\selectfont] at (23cm,3.5cm) {$\omega$};%

\end{tikzpicture}
\end{document}

what should I do

you are asking about math fonts so don't make an example that does \includegraphics{one-inc.pdf} so that no one can run the example. — David Carlisle, Nov 19 '23 at 11:24
The second argument in \fontsize{80}{200} seems needlessly large. Do consider using \fontsize{80}{96}. (It's common to set the second argument of \fontsize about 20% larger than the first.) — Mico, Nov 19 '23 at 11:31

score 3 · Accepted Answer · answered Nov 19 '23 at 11:31

A more reasonable example would be

\documentclass{article}
\begin{document}
\fontsize{80}{200}\selectfont
K $K_x$
\end{document}

which produces

with lualatex and

with pdflatex.

In both cases giving multiple warnings such as

LaTeX Font Warning: Font shape `OMS/cmsy/m/n' in size <55.99976> not available
(Font)              size <24.88> substituted on input line 7.

Use any font family other than computer modern math, or for cm, add the fix-cm package to allow arbitrary sizes.

\RequirePackage{fix-cm}
\documentclass{article}
\begin{document}
\fontsize{80}{200}\selectfont
K $K_x$
\end{document}

Produces

in lualatex

in pdflatex

How to get math font larger than Huge in node？

1 Answers1