includegraphics scale not working

Question

Im trying to change the size of the picture with "scale" but is not working

documentclass{report}

usepackage{graphicx}
usepackage[left=1.5cm,top=1cm,right=1.5cm,bottom=1cm]{geometry}
begin{document}
SweaveOpts{concordance=TRUE}

begin{figure}[htb]
begin{center}
includegraphics[scale=0.5]{D:/R/pdf/pruebas/caratula3.jpg}
end{center}
begin{center}
includegraphics[scale=1]{D:/R/pdf/pruebas/caratula3.jpg}
end{center}
end{figure}

end{document}

This is the image.

Thanks!

JPi · Accepted Answer

What do you mean it isn't working?  What happens if you add an image with scale=1?  Also, don't load graphics.

Consider the following:

documentclass{report}

usepackage{graphicx}
usepackage[left=1.5cm,top=1cm,right=1.5cm,bottom=1cm]{geometry}
begin{document}

begin{figure}[htb]
begin{center}
   includegraphics[scale=0.5]{example-image-a}
end{center}
begin{center}
    includegraphics[scale=1]{example-image-a}
end{center}
end{figure}

end{document}

guyik · Answer

I was facing the same problem (images not scaling with includegraphics[scale=value]{image}).
In my case, I was unintentionally setting the default scaling values for the includegraphics command, as detailed here: Turning off default scaling options (setkeys{Gin}) temporarily
In my case, fixing the problem was as easy as removing the following line:
setkeys{Gin}{width=<value>}

I hope others find this answer useful!

includegraphics scale not working

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