Change ggplot2 default color palette

Question

I want to customize the chart color and fill colors, how to change them for ggplots?

Answer 1

If the scale is continuous, then you can change the default palette using scale_fill/color_continuous

# default

ggplot(mpg,aes(cyl,displ))+geom_bar(stat="identity")

ggplot(mpg,aes(cyl,displ,fill = cyl))+geom_bar(stat="identity")

# color palette - Viridis

ggplot(mpg,aes(cyl,displ,fill = cyl))+geom_bar(stat="identity")+scale_fill_continuous(type = "viridis")

# Assign color to pallete manually

ggplot(mpg,aes(cyl,displ,fill = cyl))+geom_bar(stat="identity")+scale_fill_gradient(low = "red",high = "green")

If the scale is discrete, then you can provide the colors using 

# default

ggplot(mpg[1:20,],aes(x=model))+geom_point(stat="count")

ggplot(mpg[1:20,],aes(x=model,color = model))+geom_point(stat="count")

# ColorBrewer - palette options/color.

ggplot(mpg[1:20,],aes(x=model,color = model))+geom_point(stat="count")+scale_color/fill_brewer(palette = "Set1")

Hope it helps!