[R] taking a small piece of large tiff

Louisa Reynolds louisa_reynolds at yahoo.co.uk
Tue Apr 4 13:47:03 CEST 2017

Dear Forum 
I am trying to cut out a small section of a very large 2-dimensional grayscale image as a tiff in R, but it is having difficulty handling such large files.  I have looked at bigmemory and ff packages but it is unclear how I can use these packages with tiffs. Can anyone please suggest something? I have tried tiff and rtiff libraries.
Thanks in advance.
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