Thanks a lot!
That worked. I have two R related questions
when I use the
  store<-readGDAL(fname='lena256.bmp')
this returns the struct below


> str(store)
Formal class 'SpatialGridDataFrame' [package "sp"] with 6 slots
  ..@ data       :'data.frame': 65536 obs. of  1 variable:
  .. ..$ band1: int [1:65536] 255 255 255 255 255 255 255 255 255 255 ...
  ..@ grid       :Formal class 'GridTopology' [package "sp"] with 3 slots
  .. .. ..@ cellcentre.offset: Named num [1:2] 0 -722925
  .. .. .. ..- attr(*, "names")= chr [1:2] "x" "y"
  .. .. ..@ cellsize         : num [1:2] 2835 2835
  .. .. ..@ cells.dim        : int [1:2] 256 256
  ..@ grid.index : int(0) 
  ..@ coords     : num [1:2, 1:2] 0 722925 -722925 0
  .. ..- attr(*, "dimnames")=List of 2
  .. .. ..$ : NULL
  .. .. ..$ : chr [1:2] "x" "y"
  ..@ bbox       : num [1:2, 1:2] -1418 -724342 724342 1418
  .. ..- attr(*, "dimnames")=List of 2
  .. .. ..$ : chr [1:2] "x" "y"
  .. .. ..$ : chr [1:2] "min" "max"
  ..@ proj4string:Formal class 'CRS' [package "sp"] with 1 slots
  .. .. ..@ projargs: chr NA


How the "R" when I run image(store) plots the lena correct. Where it store how the file was originally?
Also when I do 

str(as.matrix(store))
this takes only the data and transforms them to the original matri

str(as.matrix(store))
 int [1:256, 1:256]

How it does that? 

Looks as "magic" to me....

B.R
Alex



________________________________
 From: Michael Sumner <mdsumner@gmail.com>

Cc: "R-help@r-project.org" <R-help@r-project.org> 
Sent: Thursday, November 24, 2011 2:25 PM
Subject: Re: [R] readGDAL or raster for reading bit map files

Just do

m <- as.matrix(store)

or

m <- as.image.SpatialGridDataFrame(store)$z

image(m)

They give the same result with different orientations.  Note that both
assume a single-band raster, e.g. you only have a "greyscale" bitmap
(for example).

The details behind all this is given in the documentation for the sp
package. See ?image for the basic image plot for a matrix.

Cheers, Mike.



> Dear all,
> I have asked yesterday of how I can read a simple bitmap file in R cran.
>
> I was suggest to use either readGDAL or raster for loading my bitmap
>
>
> a. I have done it with readGDAL like
>
>     store<-readGDAL(fname='lena256.bmp')
>     and it works,... but it converts my matrix-like notion of a bitmap to a large vector
>
> b. Raster also returns a class that I can not understand.
>
> So 1, I want to load it and keep the image as a matrix (so every cell in the matrix will correspond to a pixel)
> 2. I want to be able to plot the image based on that matrix that I have loaded too.
>
> Could you please explain me how I can do those?
>
> B.R
> Alex
>
>        [[alternative HTML version deleted]]
>
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>



-- 
Michael Sumner
Institute for Marine and Antarctic Studies, University of Tasmania
Hobart, Australia
e-mail: mdsumner@gmail.com
	[[alternative HTML version deleted]]

