Rmarkdown is an enormously useful system for combining text, output and graphics generated by R into a single document. Images, in particular, are a powerful means of communication in a report, whether they be data visualizations, diagrams, or pictures. To maximize the power of those images, Zev Ross has created a comprehensive list of tips and tricks for working with images in R markdown documents. Those tips include: How to change the width and height of images created by R, and of imported image files. How to change the resolution of your images. (Usually not an issue for HTML output,...