# [R] Plotting rgb proportions in R

Bert Gunter bgunter@4567 @ending from gm@il@com
Wed Dec 19 05:26:06 CET 2018

```3-d Proportions must sum to 1and are thus actually 2-d and should preferaby
be plotted as a ternary plot. Several r packages will do this for you, e.g.
package Ternary. Search "ternary plots" on rseek.org for others.

-- Bert

Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Tue, Dec 18, 2018 at 3:10 PM Jim Lemon <drjimlemon using gmail.com> wrote:

> Hi Tasha,
> I may be right off the track, but you could plot RGB proportions on a
> 3D plot. The easiest way I can think if would be to convert your 0-255
> values to proportions:
>
> rgb_prop<-read.table(text="Red Green Blue pct
> 249 158 37 56.311
> 249 158 68 4.319
> 249 158 98 0.058
> 249 128 7 13.965
> 249 128 37 12.87
> 188 128 37 0.029
> 249 128 68 0.161
> 188 128 68 0.015
> 188 98 7 0.029
> 219 128 7 2.773
> 219 128 37 2.583
> 188 98 68 0.058
> 219 128 68 0.525
> 249 188 37 0.876
> 249 188 68 1.08
> 219 98 7 0.482
> 249 188 98 0.015
> 249 158 7 3.852",header=TRUE)
> rgb_prop\$Red<-rgb_prop\$Red/255
> rgb_prop\$Green<-rgb_prop\$Green/255
> rgb_prop\$Blue<-rgb_prop\$Blue/255
> library(scatterplot3d)
> scatterplot3d(rgb_prop[,1:3],cex.symbols=sqrt(rgb_prop[,4]),
>  color=rgb(rgb_prop[,1],rgb_prop[,2],rgb_prop[,3]),pch=19)
>
> then plot the RGB values on a 3D scatterplot. I have included
> arguments to make the symbols the actual RGB colors that you specify
> and their size proportional to the square root of the percentages.
>
> Jim
>
> On Wed, Dec 19, 2018 at 5:17 AM Tasha O'Hara <tasha.eileen using gmail.com>
> wrote:
> >
> > Hello,
> >
> > I am trying to plot specific rgb color proportions of a marine specimen
> in
> > a stacked plot using R and I was looking for some help. I have several
> > rgb proportions per specimen (an example of one is below).  I've run into
> > different examples of people using vegan or grDevices. Can anyone help
> with
> > this?
> >
> > Red    Green  Blue   %
> > 249 158 37 56.311
> > 249 158 68 4.319
> > 249 158 98 0.058
> > 249 128 7 13.965
> > 249 128 37 12.87
> > 188 128 37 0.029
> > 249 128 68 0.161
> > 188 128 68 0.015
> > 188 98 7 0.029
> > 219 128 7 2.773
> > 219 128 37 2.583
> > 188 98 68 0.058
> > 219 128 68 0.525
> > 249 188 37 0.876
> > 249 188 68 1.08
> > 219 98 7 0.482
> > 249 188 98 0.015
> > 249 158 7 3.852
> >
> >         [[alternative HTML version deleted]]
> >
> > ______________________________________________
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> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

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