There's the alpha function in the ggplot2 package:
plot(1:90, 1:90, pch=16, cex=2, col="red")
points(1:90, 1:90, pch=16, cex=2, col=alpha(grey(90:1/90), 0.5))
Hadley
On 11/16/07, Ingo Holz <[EMAIL PROTECTED]> wrote:
> Hi,
>
> is there an easier way to get a semi-transparent grey-palette?
>
> p
Hi,
is there an easier way to get a semi-transparent grey-palette?
plot(1:90, 1:90, pch=16, cex=2, col="red")
points(1:90, 1:90, pch=16, cex=2, col=rgb(t(col2rgb(grey(90:1/90))),
alpha=100, maxColorValue=255))
windows() does support semi-transparent colours
Thanks,
Ingo
[[alternat
Although not specifically related to r-sig-geo, I'll comment a bit -
I wouldn't delete part of the cells, but rather define the transparency
bit in the color. You can do that, e.g. by
> rgb(1,0,0,0.5)
[1] "#FF80"
you'll get half transparent red. Note that you need a device that
supports t
Hi,
I have two objects of "class image" (a list of x, y, z coordinates, where z is
a
matrix and x and y are row names / col names).
I would like to overlay one of this images on top of the other. As a semi-
transparent overlay. Is this possible using function image()?
I suppose I could set
