Transparent Backgrounds for Plot

Remove background of plots

If you are using a non-white background color for your slides it can be bothersome to match the background of your plots. Setting dev.args = list(bg = 'transparent') in your chunk option removes the background of your chart and it will show the background color of the slide instead.

Note, you most likely have to change the text colors of your chart to be move visible under the new background.

Result

Rmd

---
output:
  xaringan::moon_reader:
    css: ["default"]
    lib_dir: libs
    seal: FALSE
    nature:
      highlightStyle: github
      highlightLines: true
      countIncrementalSlides: false
---

class: inverse

# Transperent Background

```{r, dev.args = list(bg = 'transparent'), fig.asp = 3/4, fig.align = 'center', echo = FALSE, out.width = "80%", dpi= 300, warning = FALSE}
library(ggplot2)
library(palmerpenguins)

ggplot(penguins) +
  aes(bill_length_mm, bill_depth_mm,
      color = species) +
  geom_point() +
  theme_minimal() +
  theme(
    text = element_text(colour = "grey90"), 
    axis.text = element_text(colour = "grey90"),
    panel.grid  = element_line(colour = "grey70")
  ) +
  scale_color_manual(values = c("darkorange","purple","cyan4")) +
  labs(title = "Bill depth and length")
```