change color saturation of scale_fill_gradient2 (ggplot)

Asked Jun 16 '16 at 18:30

Active Jun 16 '16 at 18:36

Viewed 289 times

In continuation of the topic I am trying to depict 2D surface using ggplot. The colors are determined by scale_fill_gradient2, however they are too bright and dull when the values are close to 0 (white color). I have tried scale_colour_hue to change saturation, but it doesnot work.

names(plot2d) <- c("x", "y", "z")
      ggplot(plot2d) + aes(x, y, z = z, fill = z)  + geom_tile(aes(fill = z)) +
        scale_fill_gradient2(limits=c(-40, 40), "height",
                             low=rgb(0,255,0, maxColorValue = 255), mid = "white",
                             high=rgb(255,0,0,  maxColorValue = 255), guide="colorbar") + 
        geom_raster(interpolate=TRUE) + geom_contour(color = "white", alpha = 0.5) 

     # + scale_colour_hue(h=c(180, 270))

edited May 23 '17 at 11:51

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asked Jun 16 '16 at 18:30

Aleksandr Ianevski

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Probably not relevant to your question, but why are you using geom_tile and geom_raster? Does your data span the full range set by limits? – Richard Telford Jun 16 '16 at 18:38
You know this isn't a colour blind friendly fill don't you? – Richard Telford Jun 16 '16 at 18:39
I included the link to prev. topic to show that I am smoothing surface. That is why I need geom_raster – Aleksandr Ianevski Jun 16 '16 at 18:42
No, the data span the full range set only partly but I think that it is possible to somehow change saturation of the colors – Aleksandr Ianevski Jun 16 '16 at 18:48
Sure, you need geom_raster, but do you also need geom_tile – Richard Telford Jun 16 '16 at 18:49
you are right, I do not need it – Aleksandr Ianevski Jun 16 '16 at 18:56
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use different colors in the gradient? why do you need white as the mid color? alternatively use a gradient that is not linear. – Roland Jun 16 '16 at 20:16
@Henrik, you made my day! That is what I was looking for – Aleksandr Ianevski Jun 17 '16 at 10:31

change color saturation of scale_fill_gradient2 (ggplot)

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