[Tex/LaTex] Conversion of page Geometry to Typearea with scrbook Koma Script

geometryscrbooktypearea

I've read that I shouldn't use the geometry package with KOMA-Script. So, I would like to convert my page layout to something similar using Koma-Scripts built in typearea features. 

\documentclass[american,headings=openany]{scrbook}
\usepackage{scrlayer-scrpage} %\input{headersfooters}
\usepackage{microtype}  
\usepackage{setspace} \onehalfspacing
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
%
% % % these font packages require a full install %
\renewcommand{\ttdefault}{lmtt} % monospace font %
\usepackage{libris}             % san serif font %
\usepackage{tgschola}           % roman font     %
%
%
\usepackage[paperwidth=5.06in,paperheight=7.81in]{geometry}
   \geometry{verbose,tmargin=0.75in,bmargin=0.75in,%
     lmargin=0.7in,rmargin=0.4in,headheight=0.25in,%
     headsep=0.2in,footskip=0.4in}%
%
\begin{document}

% \input{mybook} % I will input many chapters %

Hello World, this will be my book.

\end{document}

Can anyone provide me the typearea code that would replace geometry with similar results? It does not have to be exact. I want to learn which typearea options I will need, and what adjustments I need to tinker with. I've read through the scrguien.pdf but it's not sinking in very well (I'm still confused). But so far I've read about the BCOR= and DIV= options, the possible values for DIV, especially the numeric values, the last value, the areaset value. And the \typearea command. But I have no idea what to do with them.

Best Answer

Well, at last you can read the definition of the page layout with typearea in the documentation of KOMA-Script, page 24, chapter Construction of the Page Layout with typearea (you can open it with texdoc komascript.

You can also use package layout or package layouts to check the resulting values for different parameters for typearea (documentation: texdoc layout or texdoc layouts).

The main difference between geometry and typearea is, that typearea calculates an optimal typing area depending on the used fontsize but geometry "only" uses the given values for margins etc to create a typing area. With geometry there is no algorithm to calculate an typing area depending on the fontsize.

So if you want a good looking typography for the page (and you do not know what is a good typography) use typearea to calculate a good looking page. If you have to follow rules given by your university for margins etc. then it is easier to use geometry to fullfill the rules.

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