Poor resolution in knitr using Rmd

It's most likely that since this question was asked, the software has improved. I came to this question looking for how to increase the resolution of plots. I found OP's original approach worked out-of-the-box for me.

So, setting dpi=300 (because dpi=150 did not produce a sufficiently obvious difference) in the chunk's parameters, produced a much higher quality image without modifying the physical size of the images within Word.

```{r, echo=FALSE, dpi=300, fig.width=7, fig.height=7}plot(0,0,type="n",xlim=c(0,500), ylim=c(-12,0), las=1)color  <-  rainbow(500)text(380,-1,"Test",pos=4)lseq   <-  seq(-6,-2,length.out=500)for(j in seq_along(lseq)) {    lines(c(400,450), rep(lseq[j], 2), col=color[j])}polygon(c(400,450,450,400), c(-6,-6,-2,-2), lwd=1.2)```

However, setting out.width and out.height removes the production of the image entirely, with the warning "fig.align, out.width, out.height, out.extra are not supported for Word output".

Just keep things simple, set all chucks to dpi of 300 and make them wider.

Run this first thing:

```{r setup, include=FALSE}knitr::opts_chunk$set(dpi=300,fig.width=7)```

This is a great time to take advantage of knitr's built-in dynamic customization features for output types. Ths was tested with both output targets...

````{r img-setup, include=FALSE, cache=FALSE}out.format <- knitr::opts_knit$get("out.format")img_template <- switch( out.format,                     word = list("img-params"=list(fig.width=6,                                                   fig.height=6,                                                   dpi=150)),                     {                       # default                       list("img-params"=list( dpi=150,                                               fig.width=6,                                               fig.height=6,                                               out.width="504px",                                               out.height="504px"))                     } )knitr::opts_template$set( img_template )````

If you don't want to use the img_template for every image produced you can either not call the set function and instead add opts.label="img_template" to the params of the chunks you want to use it with, or override the img_template by specifying the params explicitly for the chunk.