# Rescaling many images which are scaled with \includegraphics

In a LaTeX document I have about 70 images which are scaled using the graphicx-package and \includegraphics[scale=0.8]{foo.pdf}

where the scaling factor varies. Now I would like to rescale them all with a common factor, like

\newcommand*{\factor}{0.75}
\includegraphics[scale=\factor * 0.8]{foo.pdf}


except that is no LaTeX syntax. Can anyone provide a smart solution?

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\includegraphics[scale=\factor , scale= 0.8]{foo.pdf}

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Thanks a bunch! That was quite a bit more elementary to solve than I anticipated. – Holtor Aug 11 '14 at 16:11
I would have thought [scale=0.8, scale=\factor]! – Yiannis Lazarides Aug 11 '14 at 16:21
@YiannisLazarides in an ideal world (not this one, admittedly) multiplication is commutative. – David Carlisle Aug 11 '14 at 16:39
I wonder if you could explain this a bit: it seems entirely non-intuitive to me (keys normally override each other, so I'd expect the scale here to be 0.8 not 0.8 times \factor). – Joseph Wright Aug 11 '14 at 16:48
@JosephWright includegraphics keys don't overight they are cumulative and read left to right, mainly so that [height=1cm,angle=90] makes something 1cm wide but [angle=90,height=1cm] makes something 1cm high the fact that you can use two scale is an artifact of the implementation (and not something I've done before this answer I suspect:-) – David Carlisle Aug 11 '14 at 21:00

Another solution with fp package.

\documentclass{article}
\usepackage[nomessages]{fp}
\usepackage{graphicx}

\FPset\Factor{0.75}
\FPeval\Scale{round(Factor*0.8:2)}

\begin{document}
\includegraphics[scale=\Scale]{example-image-a}
\end{document}

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