Omit Brighter colors on RColorBrewer palette to use in ggplot2

user_9535316 0
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I'd like to use the darker colors in the "Oranges" palette in RColorBrewer to use in my ggplot (bargraph). I however am unable to. Help. Below is the sample code:

my_palette = brewer.pal(n = 9, "Oranges")[4:9]


### Bar Plots ###
ggplot(Sample_df, aes(x = Sample_Score), fill = Sample_Score) + 
  geom_bar(stat = "count", width = 0.8) + scale_fill_brewer(palette= my_palette)  + scale_y_log10(labels = comma) +
   labs(title="Distribution of customers according to Sample Score",x="Sample Score", y="Number of Customers") +
     theme(plot.title = element_text(face = "bold", size = 10),
        axis.title.x = element_text(face = "bold", size = 8),  
        axis.title.y = element_text(face = "bold", size = 8), legend.position="none")
ggplot2 r
1 Answers

This is because you are using scale_fill_brewer(). This command expects an RColorBrewer palette name. (e.g. "Oranges"). It cannot read your custom palette name my_palette Instead, use scale_fill_manual()

I created an own reproducible example:

library(RColorBrewer)
library(ggplot)

set.seed(1234)
df <- data.frame(x=runif(10,0,1), y=runif(10,0,1), c=factor(sample(1:5,10,replace=T)))

ggplot(data=df, aes(x=x,y=y)) + geom_point(aes(color=c)) + scale_color_brewer(palette = 'Oranges')

As you can see, I am calling the RColorBrewer palette "Oranges". As you mentioned, these coloured are very light, and you may want to use only the darker ones. To do this, you can make a custom palette and call it using scale_color_manual() (or scale_fill_manual() in your case) instead of scale_color_brewer(). 

my_palette <- brewer.pal(name="Oranges",n=9)[4:9]

ggplot(data=df, aes(x=x,y=y)) + geom_point(aes(color=c)) + scale_color_manual(values = my_palette)

This will now use the colors you specified in my_palette

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