[R] png problem

[Paul Murrell]

Hi


Clément Calenge wrote:
> Dear R-users,
> 
> I have a small problem with the function png(), when used with the
> argument colortype="pseudo.cube".
> 
>  > png("toto.png", colortype="pseudo.cube")
>  > image(matrix(rnorm(10000), 100, 100))
>  > dev.off()
> 
> R is blocked at the last command (R does not
> print any prompt after the last command). Nothing is
> written in the file (Gimp indicates that the file is corrupted).


Did you wait long enough?  This example took a little while to complete 
for me (may need someone more familiar with the code to tell us why it 
is so slow).

Paul


> However,
> 
>  > png("toto.png")
>  > image(matrix(rnorm(10000), 100, 100))
>  > dev.off()
> 
> works fine.
> I tried:
> 
>  > options(X11colortype = "pseudo.cube")
>  > png("toto.png")
>  > image(matrix(rnorm(10000), 100, 100))
>  > dev.off()
> 
> But, here again, R is blocked. I tried to replace dev.off() by
> graphics.off(), but this does not resolve the problem.
> The problem does not occurs when the function X11() is used
> instead of the function png().
> 
> I searched through the mail archive, the FAQ, on google,
> but I did not found any solution to this problem.
> On the help page on the function png(),
> it is indicated that "The colour handling will be that of the 'X11'
> device in use".
> 
> I never used these functions before, but maybe png()
> is not suitable with colortype="pseudo.cube" ?
> Can you tell me where I have missed something ?
> Thanks in Advance,
> 
> Clément Calenge.
> 
>  >version
>           _
> platform sparc-sun-solaris2.9
> arch     sparc
> os       solaris2.9
> system   sparc, solaris2.9
> status
> major    1
> minor    9.1
> year     2004
> month    06
> day      21
> language R
> 
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> 
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-- 
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
paul at stat.auckland.ac.nz
http://www.stat.auckland.ac.nz/~paul/