[mapserver-commits] r11578 - trunk/docs/en/mapfile

[svn at osgeo.org]

Author: tbonfort
Date: 2011-04-14 09:05:58 -0700 (Thu, 14 Apr 2011)
New Revision: 11578

Modified:
   trunk/docs/en/mapfile/outputformat.txt
Log:
doc update for png/zlib compression (#3841)x


Modified: trunk/docs/en/mapfile/outputformat.txt
===================================================================
--- trunk/docs/en/mapfile/outputformat.txt	2011-04-14 15:47:05 UTC (rev 11577)
+++ trunk/docs/en/mapfile/outputformat.txt	2011-04-14 16:05:58 UTC (rev 11578)
@@ -147,6 +147,12 @@
       to record this in the resulting file as the nodata value. This is
       automatically set in WCS mode if rangeset_nullvalue is set. 
     - OGR/\*: See OGR Output document for details of OGR format options.
+    - AGG/PNG: COMPRESSION=n is used to determine the ZLIB compression applied to
+      the png creation. n is expected to be an integer value from 0 to 9, with 0
+      meaning *no* compression (not recommended), 1 meaning fastest compression,
+      and 9 meaning best compression. The compression levels come at a cost (be it
+      in terms of cpu processing or file size, chose the setting that suits you
+      most). The default is COMPRESSION=6.
     - GD/PNG and AGG/PNG both support quantizing from 24/32 bits to 8bits,
       in order to reduce the final image size (and therefore save bandwidth) (see
       also http://trac.osgeo.org/mapserver/ticket/2436#comment:4 for strategies