[Image-SIG] PIL, Python and memory issues.... HELP!

David Ascher da@ski.org
Tue, 20 Apr 1999 22:00:40 -0700 (PDT)

On Tue, 20 Apr 1999, Kevin Cazabon wrote:

> Normally, images that would require being broken up into panels for my
> application would be in the 300MB-1.5GB range (which is huge, but I'm
> dealing with a continuous-tone photographic imagesetter at 305dpi which
> prints up to 50"x100"). 


More usefully, I wonder if perhaps the format used by PIL internally isn't
VM-friendly.  I also wonder if maybe a hack to PIL which used mmap() would
be a solution which would make it VM-friendly.  If so, it might be easier
than to recode it in C (and possible would speed up PIL for 'smaller'
images as well. 

A useful paper on mmap is found at:


and the mmapfile module (not needed for this, but while I'm at it) is at



PS: In general, I think that integrating mmap into Python data structures
    would be a GoodThing (e.g. for NumPy).