[R] gray background in png

[Liaw, Andy]

Seems like a bug to me.  I tried setting theme=col.whitebg in arguments to
trellis.device, same result.  Setting options(lattice.theme=col.whitebg)
also does the same thing.  The same thing happens win.metafile() for me.
This is on WinXPPro, R-1.9.1 and

> packageDescription("lattice")
Package: lattice
Version: 0.9-16
Date: 2004/07/07
Priority: recommended
Title: Lattice Graphics
Author: Deepayan Sarkar <deepayan at stat.wisc.edu>
Maintainer: Deepayan Sarkar <deepayan at stat.wisc.edu>
Description: Implementation of Trellis Graphics. See ?Lattice for a brief
        introduction
Depends: R (>= 1.9.0), grid
License: GPL version 2 or later
Packaged: Wed Jul 7 02:39:54 2004; deepayan
Built: R 1.9.1; i386-pc-mingw32; 2004-07-07 14:00:16; windows

-- File: C:/R/rw1091/library/lattice/DESCRIPTION 

Andy

> From: Sundar Dorai-Raj
> 
> Hi all,
>    I'm having a problem creating png images with 
> trellis.device. I would 
> like to create many plots with a white background using a sequence 
> number in the file argument (i.e. "%02d"). The first plot is 
> as expected 
> with a white background. However, the second and all subsequent plots 
> have a gray background. I would like all plots to have a white (or 
> transparent) background. Below is an example:
> 
> library(lattice)
> z <- expand.grid(A = LETTERS[1:8], B = letters[1:6])
> z$x <- z$y <- rep(1, nrow(z))
> trellis.device(png, file = "test%02d.png", bg = "white")
> lset(col.whitebg())
> xyplot(y ~ x | A * B, data = z, layout = c(4, 6))
> dev.off()
> 
> This is also the case for jpeg and bmp though win.metafile and 
> postscript do not have this problem. Is this a bug or am I missing 
> something obvious?
> 
> I found one reference that implies this may be expected behaviour but 
> I'm not sure if I interpretted the comment correctly.
> 
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/18890.html

 > R.version
          _
platform i386-pc-mingw32
arch     i386
os       mingw32
system   i386, mingw32
status
major    1
minor    9.1
year     2004
month    06
day      21
language R
 > help(package = lattice)

		Information on Package 'lattice'

Description:

Package: lattice
Version: 0.9-12
Date: 2004/06/01
<snip>

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