Prevent page break of full-text-area graphic inclusion

Question

I want to include a picture with width=\textwidth and height=\textheight. In the following MWE, the picture is not placed in the desired page. It produce one blank page first and then the picture. If I do not want the blank page what should I do?

\documentclass{article}
\usepackage{graphicx}
\begin{document}
\includegraphics[width=\textwidth,height=\textheight]{picture.jpg}
\end{document}

Answer 1

Here is an example which creates a 1 page document in which the text area is filled by a suitably scaled A4 image.

I use width=\textwidth, height=\textheight, keepaspectratio. This means that the image will be as large as it can be subject to three constraints:

1. width not to exceed \textwidth,
2. height not to exceed \textheight
3. image not be be distorted i.e. the width and height will be scaled by the same factor if they require scaling.

\documentclass[a4paper]{article}
\usepackage{graphicx,geometry}
\begin{document}
\noindent\includegraphics[width=\textwidth,height=\textheight,keepaspectratio]{example-image-a4}
\end{document}

If you really want to use the entire page, rather than just the area reserved for the text block, you need a different approach:

\documentclass[a4paper]{article}
\usepackage{graphicx,geometry,kantlipsum}
\begin{document}
\newgeometry{scale=1}%
\noindent\includegraphics[width=\textwidth,height=\textheight,keepaspectratio]{enfys}\thispagestyle{empty}
\restoregeometry
\kant[1-3]
\end{document}

This produces the following two pages of output shown as a double-page spread (but with the odd page on the left):