Why does Rmd not render to pdf while html is fine

Question

If I render the following file to html, everything works. If I render to pdf, it throws the error

output file: test.knit.md ! LaTeX Error: Unknown graphics extension: .png?raw=true. Fehler: Failed to compile test.tex. See test.log for more info.

The reason is, that the Rmd is translated to

\begin{figure} \centering \includegraphics[width=4.16667in]{pics/myimage.png?raw=true} \caption{Some text here.} \end{figure}

in test.tex and above code does not make sense of course.
Example:

--- title: "Untitled" author: "Myname" date: "5 April 2019" output: pdf_document: number_sections: yes toc: yes toc_depth: '2' html_document: keep_md: yes number_sections: yes toc: yes toc_depth: 2 --- ```{r setup, include=FALSE} knitr::opts_chunk$set(echo = TRUE) ``` text ![Some text here.](pics/myimage.png?raw=true){width=400px} text

I need the ?raw=TRUE for github, see here. You can also clone the example from here!

Edit: I also asked the developers here, because I have the feeling, something goes wrong with keep_md: yes...

Yihui Xie · Accepted Answer · 2019-04-10 14:55:27Z

You can condition the image path on the output format via knitr::is_html_output(), e.g.,

--- title: "Untitled" author: "Myname" date: "5 April 2019" output: html_document: keep_md: yes number_sections: yes toc: yes toc_depth: 2 self_contained: false pdf_document: number_sections: yes toc: yes toc_depth: '2' --- ```{r setup, include=FALSE} knitr::opts_chunk$set(echo = TRUE) ``` text ```{r, echo=FALSE, results='asis'} cat( '![Some text here.](pics/myimage.png', if (knitr::is_html_output()) '?raw=true', '){width=400px}', sep = '' ) ``` text

symbolrush · Accepted Answer · 2019-04-10 08:12:29Z

I would use the following workaround:

In your .rmd remove the part ?raw=true.
After knitting to html: Read the html file into R, replace .png with .png?raw=true and store it again:

You can use the following code:

html <- readLines("your-file.html") html <- sapply(html, function(x) gsub(".png", ".png?raw=true", x)) writeLines(html, "your-file.html")

Like that you have the ?raw=true annotation in your html file (where they belong) and not in the .tex file (and the .pdf) where they don't have a meaning.

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