R help - Jun 2003 - pixmap question again

I could load a picture with gray levels only:

x <- 
read.pnm("/home/christoph/work/projects/ffa/EPrime/pics_pnm/550_0_1.pnm")
> x
Pixmap image
  Type          : pixmapGrey
  Size          : 246x192
  Resolution    : 1x1
  Bounding box  : 0 0 192 246
 
> plot(x)
works fine

BUT: how can I get to the slots as "size", "grey", etc.
 
calling: 
> x$grey
NULL
> x$size
NULL
>
why this?

I need to get the grey value of each pixel and average all grey values
over the whole picture... 

thanks

christoph




-- 
Christoph Lehmann <lehmann at puk.unibe.ch>
University Hospital of Clinical Psychiatry

I could load a picture with gray levels only:

x <- 
read.pnm("/home/christoph/work/projects/ffa/EPrime/pics_pnm/550_0_1.pnm")
> x
Pixmap image
  Type          : pixmapGrey
  Size          : 246x192
  Resolution    : 1x1
  Bounding box  : 0 0 192 246
 
> plot(x)
works fine

BUT: how can I get to the slots as "size", "grey", etc.
 
calling: 
> x$grey
NULL
> x$size
NULL
>
why this?

I need to get the grey value of each pixel and average all grey values
over the whole picture... 

thanks

christoph




-- 
Christoph Lehmann <lehmann at puk.unibe.ch>
University Hospital of Clinical Psychiatry
-- 
Christoph Lehmann <christoph.lehmann at gmx.ch>

I could load a picture with gray levels only:

x <- 
read.pnm("/home/christoph/work/projects/ffa/EPrime/pics_pnm/550_0_1.pnm")
> x
Pixmap image
  Type          : pixmapGrey
  Size          : 246x192
  Resolution    : 1x1
  Bounding box  : 0 0 192 246
 
> plot(x)
works fine

BUT: how can I get to the slots as "size", "grey", etc.
 
calling: 
> x$grey
NULL
> x$size
NULL
>
why this?

I need to get the grey value of each pixel and average all grey values
over the whole picture... 

thanks

christoph




-- 
Christoph Lehmann <lehmann at puk.unibe.ch>
University Hospital of Clinical Psychiatry
-- 
Christoph Lehmann <christoph.lehmann at gmx.ch>