[R-SIG-Mac] Exporting black and white images

[Paul J. Ossenbruggen]

Hi,

	I produced the attached black and white map in R using following set  
of commands.

par(mfrow=c(1,2))
plot(Z.pop, main = "Mp",col = gray(seq(0.0,1,0.01)))
contour(sk.pop, add=TRUE, nlev = 6, col = gray(1))
plot(Z1.vmt, main = "Mv",col = gray(seq(0.0,1,0.01)))
contour(sk1.vmt, add=TRUE, nlev = 6, col = gray(1))

Z.pop <- as.im(stuff)  where stuff is a spatstat ppp file.


The attached black and white pdf file shown here, which was saved in  
R, gives a black and light gray grid-like pattern that doesn't exist.
The attached map will not produce this image in Adode Acrobat Reader.  
It can be opened in Preview.

A black and white map looks great in R. These issues do not exist when  
"col = heat.color", etc. i.e. a color palette. In fact, Adode Acrobat  
Reader opens the file without a problem. It suggests to me that the  
black and white map is corrupted.

A method to solve this problem would be greatly appreciated.


Thanks

Paul







-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://stat.ethz.ch/pipermail/r-sig-mac/attachments/20090119/4b976fa3/attachment-0002.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: vmt2_9_BW.pdf
Type: application/pdf
Size: 602784 bytes
Desc: not available
URL: <https://stat.ethz.ch/pipermail/r-sig-mac/attachments/20090119/4b976fa3/attachment-0001.pdf>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://stat.ethz.ch/pipermail/r-sig-mac/attachments/20090119/4b976fa3/attachment-0003.html>