How to set size for local image using knitr for markdown

Question

I have a local image that I would like to include in an  Rmd file which I will then knit and convert to HTML slides with Pandoc  Per this post  this will insert the local image     Image Title  path to your image   Is there a way to modify this code to also set the image size

User · Answer

Had the same issue today and found another option with knitr 1.16 when knitting to PDF (which requires that you have pandoc installed):

![Image Title](path/to/your/image){width=70%}

This method may require that you do a bit of trial and error to find the size that works for you. It is especially convenient because it makes putting two images side by side a prettier process. For example:

![Image 1](path/to/image1){width=70%}![Image 2](path/to/image2){width=30%}

You can get creative and stack a couple of these side by side and size them as you see fit. See https://rpubs.com/RatherBit/90926 for more ideas and examples.

User · Answer

Another option that worked for me is playing with the dpi option of knitr  include graphics   like this       r  knitr  include graphics  path to image png   dpi   100            which sure  unless you do the math  is trial and error compared to defining dimensions in the chunk  but maybe it will help somebody

User · Answer

The question is old  but still receives a lot of attention  As the existing answers are outdated  here a more up-to-date solution  Resizing local images As of knitr 1 12  there is the function include graphics  From  include graphics  emphasis mine    The major advantage of using this function is that it is portable in the sense that it works for all document formats that knitr supports  so you do not need to think if you have to use  for example  LaTeX or Markdown syntax  to embed an external image  Chunk options related to graphics output that work for normal R plots also work for these images  such as out width and out height   Example      r  out width    quot 400px quot   knitr  include graphics  quot path to image png quot        Advantages   Over agastudy s answer  No need for external libraries or for re-rastering the image  Over Shruti Kapoor s answer  No need to manually write HTML  Besides  the image is included in the self-contained version of the file    Including generated images To compose the path to a plot that is generated in a chunk  but not included   the chunk options opts current get  quot fig path quot    path to figure directory  as well as opts current get  quot label quot    label of current chunk  may be useful  The following example uses fig path to include the second of two images which were generated  but not displayed  in the first chunk      r generate figures  fig show    quot hide quot   library knitr  plot 1 10  col    quot green quot   plot 1 10  col    quot red quot            r  include graphics sprintf  quot  sgenerate figures-2 png quot   opts current get  quot fig path quot          The general pattern of figure paths is  fig path   chunklabel - i   ext   where chunklabel is the label of the chunk where the plot has been generated  i is the plot index  within this chunk  and ext is the file extension  by default png in RMarkdown documents

User · Answer

Un updated answer  in knitr 1 17 you can simply use     Image Title  path to your image  width 250px    edit as per comment from  jsb  Note this works only without spaces  e g   width 250px  not  width   250px

User · Answer

If you are converting to HTML  you can set the size of the image using HTML syntax using      lt img src  path to image  height  400px  width  300px    gt    or whatever height and width you would want to give

User · Answer

The knitr  include graphics solution worked well for resizing the figures  but I was unable to figure out how to use it to produce side-by-side resized figures   I found this post useful for doing so

User · Answer

Here s some options that keep the file self-contained without retastering the image   Wrap the image in div tags   lt div style  width 300px  height 200px  gt    Image  path to image   lt  div gt    Use a stylesheet  test Rmd  --- title  test output  html document css  test css ---     Page with an image   myImagePage     Image  path to image    test css   myImagePage img     width  400px    height  200px      If you have more than one image you might need to use the nth-child pseudo-selector for this second option

User · Answer

You can also read the image using png package for example and plot it like a regular plot using grid raster from the grid package        r fig width 1  fig height 10 echo FALSE  library png  library grid  img  lt - readPNG  path to your image    grid raster img        With this method you have full control of the size of you image

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