Starting a picture at the left position and enlarging it to fill the whole page [duplicate]

Question

I'm having an image which I need to display so that it takes up most of a page (the total width of the page to be exact). The picture itself has a larger width than height and is so big in width that it is bigger than the width of the page.

My problems so far have been that I didn't manage to let the image start (left side of the page) exactly at the start of the page and go until the right border of the page (height is no matter there as the height is smaller ofr the picture and it will be vertically centered).

Even with width=\papwerwidth the pic didnt start at one border and go to the other one (also used \noindent). So question is what can I do to fullfill my target there?

\documentclass[11pt,a4paper,BCOR10mm,DIV11,toc=listof,parskip=full]{scrbook}

\usepackage[english]{babel}
\usepackage[utf8x]{inputenc}
\usepackage{amsmath}
\usepackage{graphicx}
\usepackage{booktabs}            
\usepackage{multicol}  

\begin{document}
\newpage
\includegraphics{xyz.jpg}
\end{document}

Edit: [width=\paperwidth] added tot the includegraphics scales thee image but part of it is truncated I guess thanks to the image starting not at the left border.

Answer 1

Here is a solution, the requires the ifoddside package. The idea is to put the insertion point at the exact center of the physical with an invisible rule, then insert the picture scaled to paper width ant put in a box of zero width:

     \documentclass[a4paper]{book}

    \usepackage[utf8]{inputenc}
    \usepackage[nomarginpar]{geometry}
    \usepackage{graphicx}
    \usepackage{ifoddpage}

    \newlength{\relevantmargin}
    \newcommand\insertpaperwidth[1]{%
    \checkoddpage\setlength{\relevantmargin}{\ifoddpageoroneside\oddsidemargin%
    \else\evensidemargin\fi}
    \par\noindent\hspace*{\dimexpr 0.5\paperwidth-1in -\hoffset -\relevantmargin\relax}%
    \makebox[0pt]{\includegraphics[width = \paperwidth]{#1}}}%

    \usepackage{lipsum}

    \begin{document}

     \lipsum[1-4]
     \vspace{2ex}

    \insertpaperwidth{Piero_di_Cosimo_1}

    \lipsum[5]\vspace{2ex}

    \insertpaperwidth{Piero_di_Cosimo_1}

    \end{document}