[STATSGRASS] spatstat: trend to spatialgriddataframe - help needed

[Jarekj Jasiewicz]

Hi

It seems very simple but I cannot pass throuh one step:

I computed trend (ppm) in spatstat package:

    ppm_2=ppm(unmark(pp), ~polynom(x,y,2))

next I found, that I can convert that  object to  "something almost 
like  <<im>> object" :

    k=plot(ppm_2, ngrid=c(gmeta6()$cols, gmeta6()$rows), 
superimpose=FALSE, how="image", pause=FALSE, plot.it=FALSE)

but: it is not im object. It is object which only contains im inside. 
Here is its structure:

str(k)
List of 1
 $ trend:List of 1
  ..$ :List of 11     ##here is something like "unnamed atribute" I 
cannot pass this
  .. ..$ v     : num [1:986, 1:1051] 1.06e-09 1.07e-09 1.08e-09 1.10e-09 
1.11e-09 ...
  .. ..$ dim   : int [1:2] 986 1051
  .. ..$ xrange: num [1:2] 3684409 3713995
  .. ..$ yrange: num [1:2] 5649780 5681325
  .. ..$ xstep : num 28.2
  .. ..$ ystep : num 32
  .. ..$ xcol  : num [1:1051] 3684423 3684451 3684479 3684507 3684535 ...
  .. ..$ yrow  : num [1:986] 5649796 5649828 5649860 5649892 5649924 ...
  .. ..$ lev   : NULL
  .. ..$ type  : chr "real"
  .. ..$ units :List of 3
  .. .. ..$ singular  : chr "unit"
  .. .. ..$ plural    : chr "units"
  .. .. ..$ multiplier: num 1
  .. .. ..- attr(*, "class")= chr "units"
  .. ..- attr(*, "class")= chr "im"
 - attr(*, "class")= chr "plotppm"
 - attr(*, "mrkvals")= num 1


I simply don't know how extract that part which is im object (to convert 
it next to spatialgriddataframe) or even only v (v I can insert to any 
im object and next to convert it)

I hope that problem is trivial to more advanced R users

Jarek