[GRASS5] PNG driver problem

Glynn Clements glynn.clements at virgin.net
Wed Aug 25 16:12:06 EDT 2004

David Piasecki wrote:

> I looked around last night and couldn't seem to find the version of the 
> PNG driver you mentioned. I downloaded the latest 5.3 CVS snapshot, and 
> the documentation for the PNG driver did not mention any option for 
> writing to a file other than calling d.mon stop=PNG. Is the 
> documentation incorrect, or am I looking in the wrong place? Should I 
> be looking for the latest CVS snapshot of 5.7? I tried, but I wasn't 
> able to find it, though I'm still somewhat new to CVS. It often feels 
> like a guessing game when trying to figure out what's available.

The change was made within the last week (2004/08/19 21:04:08 for the
5.3 source code; the manual page and 5.7 were updated on the 20th). If
you obtained the code directly from CVS, it should be present. If you
downloaded a CVS snapshot tar file, it may or may not be present,
depending upon the date of the snapshot; the 2004_08_21 snapshots
(both 5.3 and 5.7) should include it.

The file "pngdriver" manual page (generated from the file
html/html/pngdriver.html) should say:

   Environment variables
       Several environment variables effect the operation of  the
       PNG driver.

                     if set to "TRUE", the  image  file  will  be
                     written  after each operation (i.e. whenever
                     a  client  disconnects),  rather  than  only
                     being  written  out  when  the driver termi­

Glynn Clements <glynn.clements at virgin.net>

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