[R] Memory problem with jpeg() and wide jpegs

[michael watson (IAH-C)]

Surprisingly, Internet Explorer (which due to it's browser dominance will be the main, but not sole, purveyor of the images I create) loads this image up in a few seconds and allows the user to scroll along it very nicely.  The image is really for demonstration purposes only, and many people who use the package I am writing (if there are any) will create much smaller images of the object in question.  However, I like the fact that R can draw a whole genome in about 10 seconds, don't you? ;-)

Mick


-----Original Message-----
From:	Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk]
Sent:	Mon 12/20/2004 5:37 PM
To:	Uwe Ligges
Cc:	michael watson (IAH-C); R-help at stat.math.ethz.ch
Subject:	Re: [R] Memory problem with jpeg() and wide jpegs
It is also several times greater than the limit of human perception, being 
several feet long at printing resolutions that need a magnifying glass 
to see.

This is Windows and the limit is in the graphics card: mine is able to do 
this but I suspect you need a 128Mb card (that jpeg is of itself about 
90Mb).  However, most viewers (including PhotoShop) will barf on such a 
large jpeg.


On Mon, 20 Dec 2004, Uwe Ligges wrote:

> michael watson (IAH-C) wrote:
>
>> Hi
>> 
>> I have been creating very, very long jpeg images for the last two weeks
>> using jpeg().  All of a sudden, and I mean that, it's stopped working -
>> I've not changed a thing!  The error message I get is:
>> 
>> 
>>> jpeg("out.jpg",width=50000,height=480, quality=100)
>> 
>> Error in devga(paste("jpeg:", quality, ":", filename, sep = ""), width,
>> :         unable to start device devga
>> In addition: Warning message: Unable to allocate bitmap 
>> I have plenty of disk space in the place I want to create the jpeg, and
>> if I reduce it from "width=50000" to "width=5000", then it works no
>> problem, which suggests it is a memory problem.  If I close R and
>> re-open R the problem does not go away.  And as I said above, I have
>> been using this code for weeks with no problem, then I change nothing,
>> and start getting this error message.
>
> I don't believe it has worked. Such a huge one does not work for me even on a 
> rather big machine.
> If it had worked: On the same platform, OS, R version?
> I think you have to contribute a patch in order to get such a huge jpeg.
>
> Uwe Ligges
>
>
>> I'm running R 2.0.1 on Windows XP.  I'm going to restart Windows and see
>> if that helps, but if re-starting windows does help, is there an
>> explanation as to where all the memory R used to be able to get at
>> disappeared to in the current session?
>>
>> Cheers
>> Mick
>> 
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
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