Skip to content

Size of jpegs/pngs

2 messages · stgries@arcor.de, Brian Ripley

stgries@arcor.de
# 
Dear all

I have trouble with setting the size for jpegs and pngs. I need to save a dendrogram of 1000 words into a jpeg or png file. On one of my computers, the following works just fine: 

bb<-agnes(aa, method="ward")
jpeg("C:/Temp/test.txt", width=17000, height=2000)
plot(bb)
dev.off()

On my main computer, however, this doesn't work:
Error in jpeg("C:/Temp/test.txt", width = 17000, height = 2000) : 
        unable to start device devWindows
In addition: Warning message:
Unable to allocate bitmap 

This is a Windows XP Pro SP2 system, which is started with this chsort
_              
platform i386-pc-mingw32
arch     i386           
os       mingw32        
system   i386, mingw32  
status                  
major    2              
minor    1.1            
year     2005           
month    06             
day      20             
language R  

which is started with a shortcut.
"C:\rw2011\bin\Rgui.exe --max-mem-size=1500M"

I checked the web and the R-help pages, tried out the ppsize option, and compared the options settings with those of the machine that works (which actually runs R 2.0.1 of 15 Nov 2004), but couldn't come up with an explanation. Any idea what I do wrong?
STG
--
Stefan Th. Gries
----------------------------------------
Max Planck Inst. for Evol. Anthropology
http://people.freenet.de/Stefan_Th_Gries
----------------------------------------

Machen Sie aus 14 Cent spielend bis zu 100 Euro!
Die neue Gaming-Area von Arcor - ??ber 50 Onlinespiele im Angebot.
http://www.arcor.de/rd/emf-gaming-1
Brian Ripley
# 
I think this an issue about the amount of graphics memory.  You are asking 
for an image of about 17*2*3 = 102Mb, and you need more than that.
Windows imposes limits on the size of bitmaps: these are not
      documented in the SDK and may depend on the version of Windows. It
      seems that 'width' and 'height' are each limited to 2^15-1 and
      there is a 16Mb limit on the total amount of memory in Windows
      95/98/ME.

so I do wonder why you are surprised.

My laptop appears to be limited to about half your example with a 128Mb 
graphics card (and lots of other things going on).
On Sun, 2 Oct 2005 stgries at arcor.de wrote:

            

      
      
      
    

        
Did you read the help page?