[R] col2rgb() function

Hello I have a palette vector of colour blind colours (in hexadecimal) which I’m using for plots, but they are not see-through, and as I wanted to overlay some histograms I wanted to convert these colours to rgb, when you can set the opacity. I have found the function col2rgb(), which works in th

Re: [R] col2rgb() function

Does adjustcolor() help? cb8<- c("#00", "#E69F00", "#56B4E9", "#009E73","#F0E442", "#0072B2", "#D55E00", "#CC79A7") plot(0,0,xlim=c(1,8),ylim=c(0,1)) points(1:8,rep(0.5,8),col=cb8,pch=19,cex=2) points(1:8,rep(0.75,8),col=adjustcolor(cb8, alpha.f = 0.3), pch=19,cex=2) On 2023-07-23 2:15

Re: [R] col2rgb() function

On 23/07/2023 2:15 p.m., Nick Wray wrote: Hello I have a palette vector of colour blind colours (in hexadecimal) which I’m using for plots, but they are not see-through, and as I wanted to overlay some histograms I wanted to convert these colours to rgb, when you can set the opacity. I have fou

Re: [R] col2rgb() function

Thanks That works nicely Nick On Sun, 23 Jul 2023 at 19:26, Ben Bolker wrote: >Does adjustcolor() help? > > cb8<- c("#00", "#E69F00", "#56B4E9", "#009E73","#F0E442", "#0072B2", > "#D55E00", "#CC79A7") > plot(0,0,xlim=c(1,8),ylim=c(0,1)) > points(1:8,rep(0.5,8),col=cb8,pch=19,cex=2)

Re: [R] col2rgb() function

Just one addition which may or may not be useful: The color palette you use is also known as "Okabe-Ito" and it is the default set of colors in the palette.colors() function. This function also has an optional alpha argument. So if you want to generate these colors with an alpha of 0.3 you can

Re: [R] col2rgb() function

Thanks v useful to know Nick On Sun, 23 Jul 2023 at 21:13, Achim Zeileis wrote: > Just one addition which may or may not be useful: The color palette you > use is also known as "Okabe-Ito" and it is the default set of colors in > the palette.colors() function. This function also has an optional

Re: [R] col2rgb() function

Nick, I've also made colors transparent by pasting the hex equivalent of, say, 0.3*256 = 76.9 to the hex color code. e.q. for black it might be "#004d" and the 4d is 77 in hex. That way you don't need to convert back and forth so much. If col is "#00" the transparent version is tcol <-

Re: [R] col2rgb() function

You could also adjustcolor for this approach (levels of red, green, blue, alpha can all be adjusted proportionally) On 2023-07-23 5:35 p.m., David Stevens via R-help wrote: Nick, I've also made colors transparent by pasting the hex equivalent of, say, 0.3*256 = 76.9 to the hex color code. e.