ggplot2：为什么Semi-Transparency + pdflatex会导致比正常的PDF字体更严重？ [英] ggplot2: Why Does Semi-Transparency + pdflatex Cause Heavier-Than-Normal PDF Fonts?

问题描述

ggplot2：为什么semi-Transparency + pdflatex会导致比正常的PDF字体更重要？

ggplot2: Why Does Semi-Transparency + pdflatex Cause Heavier-Than-Normal PDF Fonts?

我遇到了一个问题，其中在R中输入pdf（）然后输入 pdflatex -ing ggplot2图像会使与图像相同页面上的所有文本变得底气，但只有当 alpha < 1.这是R中的一个小例子：

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)

比较输出文件 test1.pdf 和 test2。 pdf ，我注意到后者文档在Acrobat或Acrobat Reader中查看时具有较重的字体。这个问题已经被讨论过了这里 a>之前，但没有解决。

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.

我似乎无法解决这个问题，这弄乱了我用Sweave生成的报告的外观。有没有人有任何洞察力呢？我在Windows上使用R 2.13.1版本。

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.

推荐答案

试试 pdf（）带参数的函数， colormodel =cmyk？

require("ggplot2")
pdf("test_cmyk.pdf", colormodel = "cmyk")
ggplot(mtcars, aes(wt, mpg)) + geom_point(size = 3, alpha = 0.2) +
  opts(title = "cmyk, alpha = 0.2")
dev.off()
embedFonts("test_cmyk.pdf")

在我的环境中，它似乎比 colormodel =rgb XP，Adobe Acrobat 9 Pro）。

It seems to be slightly better than colormodel = "rgb" in my environment (Win XP, Adobe Acrobat 9 Pro).

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