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This question already has an answer here:

I would like to tune layout of a document by relative adjustment of all font sizes. Now the document is \documentclass[11pt]{book} with LuaLaTeX. What would be a working equivalent of \documentclass[10.8pt]{book}? (Preferrably standard LaTeX or stand-alone packages; switching class to KOMA or similar would be difficult.)

marked as duplicate by Schweinebacke, Troy, Mico, Andrew Swann, user36296 May 29 '17 at 14:40

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  • 0.05pt is a bit less than 0.02mm: do you think you can see a difference? – egreg May 29 '17 at 11:59
  • @egreg No, but that's the point, it might reduce the document from 180 to a few pages less while being visually the same. Let me change the question to 10.8 perhaps? ;) – eudoxos May 29 '17 at 12:53
  • You can use package scrextend with option fontsize=10.8pt. You need a scalable font. But AFAIK with LuaLaTeX Latin Modern is already the default (and scalable). – Schweinebacke May 29 '17 at 12:56
  • Related: Amsart with 14pt possible? – Schweinebacke May 29 '17 at 12:58
  • @Schweinebacke could you put this as answer? Thanks! – eudoxos May 29 '17 at 13:26
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Incomplete Answer, because I have not tried it. This might set you in the right direction.

The problem is that the values of the LaTeX size macros (sizes and their associated baseline skips) are hard-coded in most classes (all classes?).

You'd think \normalsize would be the base size and the rest proportionally larger or smaller based on some fixed factor. This it not the case as seen in the files

./tex/latex/base/size12.clo
./tex/latex/base/size11.clo
./tex/latex/base/size10.clo

or in the extended sizes

./tex/latex/extsizes/size17.clo
./tex/latex/extsizes/size14.clo
./tex/latex/extsizes/size20.clo
./tex/latex/extsizes/size9.clo
./tex/latex/extsizes/size8.clo

I think you'd need to create your own size10.8.clo file that defines the following standard sizes.

\tiny                   
\scriptsize         
\footnotesize       
\small      
\normalsize
\large
\Large
\LARGE
\huge    
\Huge 
  • book will not use size10.8.clo nor book10.8.clo, because it even does not recognize option 10.8pt. – Schweinebacke May 29 '17 at 13:36

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