On Thu, 2006-10-19 at 15:14 -0500, Kevin Wright wrote:
> My setup: R 2.4.0, Windows 2000, Acrobat Reader 7.
>
> When I create a .pdf with translucent colors, the translucency works
> correctly for points, but not for text. Below is some R code that
> creates a .pdf with this phenomenon.
>
> I was going to report this as a bug in R, but then I tried to view the
> pdf with a couple of other viewers and found that at least one of the
> viewers correctly displayed the file (with translucent text), so maybe
> it is a bug with Acrobat Reader. It might be worth checking to see if
> colors for "text" are handled any differently than colors for "points"
> that might cause this problem.
>
> Best,
>
> Kevin Wright
>
>
> black <- rgb(0,0,0,.75)
> blue <- rgb(0, .2, 1, .75)
> red <- rgb(1,0,0,.75)
> pdf("pdfcols.pdf", version="1.4")
> set.seed(50)
> plot(.5,.5,type="n",xlim=c(0,1),ylim=c(0,1))
> points(runif(200),runif(200), col=black)
> points(runif(200),runif(200), col=blue)
> points(runif(200),runif(200), col=red)
> text(.1, .1, "This is red", col=red)
> text(.1, .1, "Also red", col=red)
> text(.2, .2, "This is blue", col=blue)
> text(.2, .2, "Also blue", col=blue)
> text(.3, .3, "This is black", col=black)
> text(.3, .3, "Also black", col=black)
> points(runif(200),runif(200), col=black)
> points(runif(200),runif(200), col=blue)
> points(runif(200),runif(200), col=red)
> dev.off()
I can confirm problems on FC5 using Reader 7.0.8. The text appears
opaque.
An easier to see plot example might be:
black <- rgb(0, 0, 0, .5)
blue <- rgb(0, .2, 1, .5)
red <- rgb(1, 0, 0, .5)
pdf("TL.pdf", version = "1.4")
plot(1, 1, type = "n")
text(1.01, 1, "XXXXXXX", cex = 5, col = black)
text(1.02, 1, "XXXXXXX", cex = 5, col = red)
text(1.03, 1, "XXXXXXX", cex = 5, col = blue)
dev.off()
Using the 'Document Viewer' application on FC5, which is Evince, and
xpdf, the text is clearly translucent.
It's a bug in Adobe, unless there is a setting in Reader that impacts
this. Reviewing and trying some (ie. CoolType, Smoothing, etc.), there
is nothing immediately apparent that effects the display.
PDF File attached.
HTH,
Marc Schwartz
TL.pdf
Description: Adobe PDF document
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