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[Plplot-cvs] SF.net SVN: plplot:[9204] trunk/doc/docbook/src/api.xml
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From: <and...@us...> - 2008-12-19 11:56:57
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Revision: 9204
http://plplot.svn.sourceforge.net/plplot/?rev=9204&view=rev
Author: andrewross
Date: 2008-12-19 11:56:53 +0000 (Fri, 19 Dec 2008)
Log Message:
-----------
Update plscompression documentation to describe those devices that use
the compression parameter and what it means.
Modified Paths:
--------------
trunk/doc/docbook/src/api.xml
Modified: trunk/doc/docbook/src/api.xml
===================================================================
--- trunk/doc/docbook/src/api.xml 2008-12-19 10:20:49 UTC (rev 9203)
+++ trunk/doc/docbook/src/api.xml 2008-12-19 11:56:53 UTC (rev 9204)
@@ -9906,7 +9906,7 @@
<para>
Set device-compression level. Only used for drivers that provide
compression. This function, if used, should be invoked
- before a call to &plinit;.
+ before a call to &plinit;.
</para>
<variablelist>
@@ -9919,8 +9919,16 @@
<para>
The desired compression level. This is a device-dependent
value.
+ Currently only the jpeg and png devices use these values. For jpeg
+ value is the jpeg quality which should normally be in the range 0-95.
+ Higher values denote higher quality and hence larger image sizes. For
+ png values are in the range -1 to 99. Values of 0-9 are taken as the
+ compression level for zlib. A value of -1 denotes the default zlib
+ compression level. Values in the range 10-99 are divided by 10 and
+ then used as the zlib compression level. Higher compression levels
+ correspond to greater compression and small file sizes at the
+ expense of more computation.
</para>
- <!-- TODO: what is the interpretation? In general: what documentation on devices? -->
</listitem>
</varlistentry>
</variablelist>
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