[Tex/LaTex] includegraphics image resolution stopped working

graphicsresolutiontlmgrupdate

Using texlive 2016 and TeXstudio 2.12.6, the following example worked:

\documentclass{article}
\usepackage{graphicx}
\begin{document}
\includegraphics[resolution=300]{figure.png}
\end{document}

Then I did this:

tlmgr update --self
tlmgr update --all

Now, the same example gives the following error:

! Package keyval Error: resolution undefined.

How can I figure out what changed, and in which package(s)?

Best Answer

The resolution key was amongst a rather large number that had 'appeared' in pdftex.def but were not supported in graphics and were undocumented. As part of the process of bringing .def support back 'in house' to the LaTeX team, these various keys were removed with some then being re-introduced in the graphics core (and documented). The resolution key is not currently supported: the team would need to see good reasons for adding this to the main body of graphics.

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