R: ggplot2, why does my legend show faded colors?

Question

Why is my legend faded in these examples below? Notice how the colours in the legend are not as vivid as the colours in the plot:

library(ggplot2)
r <- ggplot(data = diamonds, aes(x = carat, y = price, color = cut, group = cut))
r + geom_smooth() #(left)
r + geom_smooth(size = 2)  #(right)

EDIT: added a close-up alt text http://img163.imageshack.us/img163/4715/screenshot20100411at725.png

Answer 1

I think they are the same colour - it's the different surrounds that make them look different.