Hmmm,

Ok, here is what seems to be happening:  When the size of the vertical axis
(I didn't test horizontal) exceeds somwhere around 2250 inches, the gimp
dies or locks up.  It doesn't seem to matter what the size of the file is,
and it doesn't matter how many pixels there are.

Using File -> New, both 1024 x 162000 pixels at 72 dpi and 1024 x 450000
pixels at 200 dpi work fine, while both 1024 x 163000 pixels at 72 dpi and
1024 x 453000 pixels at 200 dpi fail.  I have no idea exactly what could be
causing this, but obviously an overflow or overrun of some type seems
likely.

Any gimp developers out there care to take a look at this?  I'm running
1.2.4 under Win 2K.  Fred was running under Suse Linux 8.0 I believe.

Thanks in advance,
s/KAM


----- Original Message -----
From: "Kevin Myers" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Cc: "gimp users" <[EMAIL PROTECTED]>; "gimpwin users"
<[EMAIL PROTECTED]>
Sent: Thursday, January 09, 2003 12:35 AM
Subject: Re: [Gimp-user] GIMP Image Size Limits


> Hi Fred -
>
> Thanks for the info.  Just encountered some rather surprising results on
my
> own system, and sent you a separate note regarding that.  Your results are
> similar to what I experienced previously on my system, but at around 400MB
> instead of 273MB.  FWIW, I have 1.5GB of RAM on my Win 2K based system.
Now
> I am even more confused!  I'll do some more testing and let you know what
I
> figure out...
>
> Thanks again,
> s/KAM
>
>
> ----- Original Message -----
> From: "Fred Bazolo" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Thursday, January 09, 2003 12:30 AM
> Subject: Re: [Gimp-user] GIMP Image Size Limits
>
>
>
> Kevin,
>
> I may be able to save you the trouble.
>
> While I was waiting, I went ahead and just tried to make some 400 MB tiff
> files. I got as high as 273MB and my system didn't like it, but it did it.
>
> Above that, the GIMP just died and went away - literally! I set the
> preferences so as to allow as much free memory as possible but that's the
> best I'm able to do. So I wonder, is there some sort of ~300 MB limit with
> tiff files, or is it just my system, or the way I had things set up. Don't
> know.
>
> I was using color tiffs if that is useful.
>
> On Thursday 09 January 2003 00:26, Kevin Myers wrote:
> > Hi Fred -
> >
> > Fortunately, it isn't actually necessary to use a 400+MB file to test
for
> > the problem.  I am uploading a 500M pixel file to an ftp site that I
will
> > point you to shortly.  This file is 1 bit per pixel and using group 4
> > compression is only about 6MB in size.  Hopefully that will download a
lot
> > faster, and it will still trigger the 2GB pixel cache limit if it exists
> > (500M pixels * 5 bytes per pixel = 2.5GB).
> >
> > Thanks for your help!
> >
> > s/KAM
> >
> >
> > ----- Original Message -----
> > From: "Fred Bazolo" <[EMAIL PROTECTED]>
> > To: "gimp users" <[EMAIL PROTECTED]>
> > Sent: Wednesday, January 08, 2003 11:22 PM
> > Subject: Re: [Gimp-user] GIMP Image Size Limits
> >
> >
> > Whew! That would be a test of my system!
> >
> > Like I mentioned earlier, the largest files I ever tried to work with
were
> > about 100 MB, and although it worked it was too annoying to bother with.
> >
> > But it would be fun to try a 400 mb file. I could just set the
preferences
> > parameters really high, close down everything else and see what happens.
> >
> > It will take a few minutes just to download a 400 mb file!
> >
> > On Thursday 09 January 2003 00:11, Kevin Myers wrote:
> > > Sorry Fred and all, my apologies, 400KB was a serious typo.  That
should
> > > have read 400MB!
> > >
> > > s/KAM
> > >
> > >
> > > ----- Original Message -----
> > > From: "Fred Bazolo" <[EMAIL PROTECTED]>
> > > To: "gimp users" <[EMAIL PROTECTED]>
> > > Sent: Wednesday, January 08, 2003 11:12 PM
> > > Subject: Re: [Gimp-user] GIMP Image Size Limits
> > >
> > >
> > > I am curious about your file sizes though: 400 KB doesn't sound all
that
> > > big;
> > > actually, that sounds pretty small. Also, I'm not very technical so
bear
> > > with
> > > me, but isn't 5 times 400 KB about 2.0 MB? What am I missing here?
> > >
> > > On Wednesday 08 January 2003 23:31, Kevin Myers wrote:
> > > > Under Windows I am running into a problem where the GIMP's pixel
> buffer
> > > > seems to hit a 2GB file size limit when my gray scale TIFF image
files
> > > > excede roughly 400KB in size.  I'm guessing the buffer requires 5
> bytes
> > >
> > > per
> > >
> > > > pixel (RGB, transparency, ?), even though all of that isn't really
> >
> > needed
> >
> > > > for my images.
> > > >
> > > > I need to work with these images absolutely ASAP.  Because all of
the
> > > > machines involved are running Windoze, I was hoping to stick with
> that.
> > > > However, it's starting to look like that is a hopeless cause given
my
> > > > poor porting skills and the apparant lack of interest of most gimp
> > > > developers
> > >
> > > in
> > >
> > > > addressing this problem under Windoze (at least in the near term).
> > > >
> > > > So, I'm starting to consider using Linux instead, and have two
related
> > > > questions:
> > > >
> > > > 1. Can anyone out there positively confirm that running the GIMP
under
> > > > a fairly recent version of Linux would avoid any inherent 2GB pixel
> > > > buffer size limit?  I can provide some images for testing if anyone
> > > > would like to volunteer...
> > > >
> > > > 2. Would anyone out there care to suggest a readily available
> > > > commercial Linux distribution that is extremely easy to install,
> learn,
> > > > and use for unsophisticated users with primarily Windblows
experience?
> > > >
> > > > Thanks in advance for any help.
> > > >
> > > > s/KAM
> > > >
> > > >
> > > > _______________________________________________
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