[R] PNG-import into R

[Rajarshi Guha]

On Mon, 2005-11-21 at 09:38 -0500, Tuszynski, Jaroslaw W. wrote:

> 
> Also does anybody know how hard would it be to tap into C code needed for
> 'read.jpeg', 'png' and 'jpeg' functions to write 'read.png' , 'write.png',
> and 'write.jpeg' functions?

Not too difficult (at least with libpng).

I was fiddling with adding a read.png method to the rimage package for
my own use, but have not really finished it.

The code is based on the example code from the libpng docs and and an
O'Reilly article

The C code and R wrapper can be found at

http://blue.chem.psu.edu/~rajarshi/code/R/pngio.c
http://blue.chem.psu.edu/~rajarshi/code/R/png.R


Right now it segfaults, so its not really useful yet.

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