R help - Apr 2009 - reading an image and adding a legend

Hi all,

I would like to
1. Read in an arcmap image into R (I can export pretty much any type of image
jpeg, bitmap etc from arcmap)
2. Use R to create a nice colour legend in the plot

First of all, Is this possible?

So far I'm stuck on point 1. I have tried read.pnm() from pixmap and
read.jpeg() from rgl.

the pnm example provided works fine
x <- read.pnm(system.file("pictures/logo.ppm",
package="pixmap")[1])
plot(x)
#draws an R logo, nice :-)

But my code returns an error

x<-read.pnm("C:/Documents and Settings/simonp/My Documents/Simon
BTO/RELU/GIS data/ten km areas in analysis.bmp")
Error in pm.readmagicnumber(con) : Not a PNM format file

I have tried changing the dpi when I export the image but still no cigar.
I have dredged the help forum for related files and read the help files. My Os
is windows XP and i'm running 2.8.1.

I feel I'm missing something obvious!
Thanks



Dr. Simon Pickett
Research Ecologist
Land Use Department
Terrestrial Unit
British Trust for Ornithology
The Nunnery
Thetford
Norfolk
IP242PU
01842750050

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Simon Pickett <simon.pickett <at> bto.org> writes:
> But my code returns an error
> 
> x<-read.pnm("C:/Documents and Settings/simonp/My Documents/Simon
BTO/RELU/GIS
data/ten km areas in analysis.bmp")
> Error in pm.readmagicnumber(con) : Not a PNM format file
Error message seems quite clear: bmp a non-supported format. Some year ago,
the wisdom was to convert your images using imagemagick

http://finzi.psych.upenn.edu/R/Rhelp02/archive/23131.html

But read.jpeg should work (another variant in rimage), if that's good enough
for your graphics

Dieter