[R] image with R
Prof Brian D Ripley
ripley at stats.ox.ac.uk
Wed May 23 16:34:16 CEST 2001
On Wed, 23 May 2001, Olivier Martin wrote:
> Hi all,
> i would like to analyze some images with R.
> For example, i have a tif image (16 bit=2^16 values) that i convert in
> ascii file (8 bit =256 values only)
> so it is easy to work under R with image() function.
> But, i would like to keep my image with 2^16 values...
> how can i do to load my tif image in my workspace?
> Do you know if there is a package for analysis image ?
Indeed there is: AnalyzeIO. But `tif' is so ill defined that you would
need to convert to a more standard format (via ImageMagick, netpbm)
and read it with Rstreams or the binary connections functions.
Since the smallest R type is 32 bits (signed) there is no problem using
16 bits, and we do it all the time.
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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