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ggplot2: Why Does Semi-Transparency + pdflatex Cause Heavier-Than-Normal PDF Fonts? I've run into a problem where pdf() ing in R and then pdflatex -ing a ggplot2 image causes all of the text on the same page as the image to become emboldened, but only when alpha < 1. Here's a minimal example in R: require("ggplot2") "%_%" <- function(a, b) paste(a, b, sep="") test <- function(filename, alpha) { pdf(filename %_% "-fig.pdf") p <- ggplot(mtcars, aes(wt, mpg)) + geom_point(alpha=alpha) print(p); dev.off() latexDocument <- c( "\\documentclass{article}", "\\usepackage{Sweave}", "%\\pdfpageattr{/Group <</S /Transparency /I true /CS /DeviceRGB>>}", "\\begin{document}", "Lorem ipsum dolor sit amet, consectetur adipiscing elit.", "\\begin{figure}", "\\includegraphics{" %_% filename %_% "-fig}", " \\caption{Figure Caption}", "\\end{figure}", "\\end{document}") con <- file(filename %_% ".tex"); writeLines(latexDocument, con); close(con) system("pdflatex " %_% filename) } test("test1", 1) test("test2", 0.3) Comparing the output files test1.pdf and test2.pdf , I notice that the latter document has heavier fonts when viewed in Acrobat or Acrobat Reader. The problem has been discussed here before, but to no resolution. I can't seem to solve the problem, which messes up the look of reports I generate with Sweave. Does anyone have any insight into it? I'm using R version 2.13.1 on Windows.

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