[Gimp-user] Can't open extremely large .PNG

[Deixis]

>It's OK, but giving information about your system is really really
>important when asking for help with software crashes.
>Windows might need a large swap file (on the same partition as the
>main
>Windows disk, good old C: itself) so that might be a problem. Also
>make
>sure you have downloaded 64-bit versions of GIMP or whatever you're
>using.
>Most software to do that will need to load the image into memory.
>
>Do you know the dimensions (size in pixels) of the image? And whether
>it's RGB colour or greyscale?? Or is the image publicly available
>somewhere? And, what size do you want to end up with?
>
>Does Windows Picture Viewer open the image? IrfanView is popular but
>has a 32-bit limit on file size, so even though your PNG image is only
>one gigabyte in disk size, it's compressed; if it uncompresses to more
>than 4 gigabytes, IrfanView will probably crash, as will most other
>32-
>bit programs.
>
>Some other programs:
>* http://www.fastpictureviewer.com/ [view only, no resize]
>* http://delhoume.frederic.free.fr/vliv.htm can export the current
>zoom
>view; shareware
>* http://fwtools.maptools.org/ (may be hard to use)
>
>Liam

Thanks. 

Yes, I have the 64 bit version of Gimp.
I only have about 80 GB of swappable space on my HD left, so that may be an
issue if 1 GB will decompress over that limit.
I don't know the dimentions of the map.
It's colour, but the amount of colours will probably limited. Maybe more than
256 colours, very likely not photo-realism colours. I don't now know if the
colour map was optimized, I kinda doubt it personally. It would probably end up
needing the same amount of memory again anyhow, decompressed.
The image is not publicly available, AFAIK I am the only person with a copy. 
The size I'm hoping to end up with is 4000x4000.
Windows Picture Viewer doesn't open it., neither does Infran View, Nip2, Fast
Picture Viewer, Image Magick and a few other tools I thought would have been
able to do it. I tried improving the compression with a tool called PNGcrush,
but it ended up making the file bigger for some reason (and still wouldn't let
any program open it).

VLIV seemed like the best candidate also, seemed like an excellent candidate,
but it won't open .png, only TIFF (which usually makes the most sense for large
images) and a few other weird file formats. Because I did have a bit of hope
VLIV could do it, I tried finding tools that could convert the image to TIFF.
Sadly all I could find again either crashed or had memory/swap space issues.

http://fwtools.maptools.org/ is beyond me, I think. I have to set a limit to
what I can do / understand and it's about there.

-- 
Deixis (via www.gimpusers.com/forums)
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