I asked similar question here How to have headers, section headings, and figures expand into the margin?
From Document class for designing a book
I want to have new insight...
\documentclass[12pt,parskip=half, DIV=calc, BCOR=10mm, x11names]{scrbook}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern, libertine}
\usepackage{amsmath, xcolor, tcolorbox, empheq}
\usepackage[ilines, headsepline]{scrpage2}
\setheadwidth[0pt]{textwithmarginpar}
gives page number in margin.
Is there any KOMA option to make the figure to use margine space. I want to center the figure using length "textwidth+marginewidth".
Can i use something similar to code below for entire document only for text and equations (Not for tables and figures)
\begin{addmargin}[4em]{0em}
text
\end{addmargin}