For the visualization part, I use ggplotly and next knit my markdown file into HTML. Next, when I want to download a static image from plotly output, the quality of the PNG file is very low. So, I wonder if there is a way to increase the quality of downloadable static images in plotly?
You can modify the mode bar when you create a Plotly object. (You can add the change later, as well.) You can see more options regarding the modebar here.
For example:
library(plotly)
data(gapminder, package = "gapminder")
plot_ly(data = gapminder, x = ~continent, y = ~lifeExp,
type = "bar") %>%
config(
toImageButtonOptions = list(
format = "svg",
filename = "myplot",
width = 600,
height = 700
)
)