Change Transparency of ggplot2 Plot Legend Items in R (Example Code)

This article shows how to adjust the transparency of ggplot2 legend items in R programming.

Preparing the Example

data(iris)                                       # Load and inspect iris data
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9         3.0          1.4         0.2  setosa
# 3          4.7         3.2          1.3         0.2  setosa
# 4          4.6         3.1          1.5         0.2  setosa
# 5          5.0         3.6          1.4         0.2  setosa
# 6          5.4         3.9          1.7         0.4  setosa
install.packages("ggplot2")                        # Install ggplot2 package
library("ggplot2")                                 # Load ggplot2 package
my_plot <- ggplot(iris, aes(x = Sepal.Length,    # Default ggplot2 graph
                            y = Sepal.Width,
                            colour = Species)) +
  geom_point()
my_plot                                          # Drawing graph

r graph figure 1 change transparency ggplot2 legend items r

Example: Decreasing Legend Alpha of ggplot2 Graphic in R

my_plot +                                        # Modifying alpha of legend items
  guides(colour = guide_legend(
    override.aes = list(alpha = 0.3)))

r graph figure 1 change transparency ggplot2 legend items r

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