[mapserver-users] temp files

[Fawcett, David]

Ken, 
 
You can definitely output 24-bit pngs.  
 
The output format page at
http://mapserver.gis.umn.edu/docs/reference/mapfile/outputformat
appears to be a little out of date.  
 
If you are using MapServer 5.x, take a look at
http://mapserver.gis.umn.edu/docs/howto/agg-rendering-specifics
 
About the temp files, I don't believe that you create temp files when
MapServer is acting as a WMS server.  (Just like in mode=map).  If
MapServer is acting as a WMS client, it stores a copy of the incoming
image in the tmp folder.  Regardless, if the images aren't being stored
in the directory that you have defined as IMAGEPATH, don't worry about
images hiding in the cooling fins (or the Hello Kitty mouse pad...)
 
David.

	-----Original Message-----
	From: mapserver-users-bounces at lists.osgeo.org
[mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Ken S.
Elvehjem
	Sent: Wednesday, February 20, 2008 10:31 PM
	To: mapserver-users at lists.osgeo.org
	Subject: [mapserver-users] temp files
	
	
	Hi,
	 
	2 items-- may be interconnected???
	 
	I recently set up a WMS mapserver using MS4W.  It works better
than I have any right to expect, what with it being my first real
attempt; would have never gotten that far without help from the list.
	 
	During the setup phase, I was having the raster data output as
PNG files.  Which looked awful.  Which is because I was used to seeing
these aerial photos as 24 bit jpeg files.   (the documentation seems to
indicate an 8-bit limit on png colors...?)
	 
	They would dutifully create a temporary png file in the tmp
folder.
	 
	Then,  I changed my map file and my request URL to indicate jpeg
files, which works great.  My observation is that my mapserver is no
longer storing temporary files. 
	 
	This also is good news -- because I don't have to delete them --
but I am a little worried that they are building up somewhere else --
like in the cooling fins on my cpu, or in my power supply ;>)  
	 
	Seriously, can someone explain about the apparent 8-bit limit in
png files (is it true, will it change, etc.) and suggest where the temp
files are going?  Below is the "WEB" section of my .map file...
	 

		  WEB
		        TEMPLATE "SD.html"
		         IMAGEPATH "C:\ms4w\Apache\htdocs\tmp/"     #
have verified the correct path!
		         IMAGEURL "/tmp/"
# and it saved png tmp files to it
		 
		         METADATA
		              "wms_title"           "WMS McCOOK"
		              "wms_onlineresource"
"http://206.183.188.202/cgi-bin/mapserv?"
		              "wms_srs"             "EPSG:26914
EPSG:26914"
		 END

	  END
	 
	 
	Sincerely,
	 
	Ken
	Ken S. Elvehjem
	ELVEHJEM TECHNICAL SUPPORT
	250 Drury Ave
	PO Box 37
	Lowry MN  56349
	320.283.5684
	320.283.5247 h
	320.424.1299 c

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