[R] Reading JPG files within R

[Roger Bivand]

On Thu, 6 Nov 2003, Paolo Sirabella wrote:

> Dear R-listers,
> I am an enthusiastic new to R and have the following simple (. I hope .)
> problem:
> I am searching a function that allows to import jpg files as matrices (n
> x m x 3) i.e. n_pixels x m_pixels x 3_colors.
> I have seen the pixmap library, but it seems able only to read BMP
> pictures (and not all them .).

I don't think your question was answered straight away, and maybe you have 
found a solution yourself. Typically, you can convert your JPG to the 
format handled by the pixmap package, PPM, in a graphics utility such as 
ImageMagick on Windows or Unix/Linux, and then use pixmap, which gives you 
an array in its pixmapRGB form.

> Can someone give me some suggestions ? 
> Thank you in advance.
>  
> =========================================
> Paolo Sirabella
> University of Rome "La Sapienza" - Rome - Italy
> Dept. of Human Physiology and Pharmacology
> Biophysiscs Group
> =========================================
>  
> 
> 	[[alternative HTML version deleted]]
> 
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-- 
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