[R] Convering image formats

Roger Bivand Roger.Bivand at nhh.no
Wed Mar 20 09:31:19 CET 2002

On Tue, 19 Mar 2002, Kenneth Cabrera wrote:

> Hi again, R users and developers:
> How can I convert an image to a numerical matrix in R?
> The image must be in a particular format? BMP, JPG, GIF?
> The original image are not too big 800 x 600 pixels and 16 colors.
> Finaly I want the 800x600 integer matrix of the image to handle in R.

library(pixmap) reads pnm, all of the above can be converted to pnm. My
guess would be that you need an indexed pixmap.


Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Breiviksveien 40, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 93 93
e-mail: Roger.Bivand at nhh.no
and: Department of Geography and Regional Development, University of
Gdansk, al. Mar. J. Pilsudskiego 46, PL-81 378 Gdynia, Poland.

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