Update info

diff --git a/doc/info/attrs.html b/doc/info/attrs.html
index 6a79d0a7c844b04f23fe250d6c511a074428d52f..8ca76e7a0cf4185db262719080a31e190809cfb3 100644 (file)
--- a/doc/info/attrs.html
+++ b/doc/info/attrs.html
@@ -856,7 +856,8 @@ This field indicates which graph component uses the attribute.
 
 <DT><A NAME=d:image HREF=#a:image><STRONG>image</STRONG></A>
 <DD>  Gives the name of a file containing an image to be displayed inside
-  a node. The image file must be in one of the recognized formats,
+  a node. The image file must be in one of the recognized 
+  <A HREF=output.html#d:image_fmts>formats</A>,
   typically JPEG, PNG, GIF or Postscript, and be able to be converted
   into the desired output format.
   <P>
@@ -1490,6 +1491,7 @@ This field indicates which graph component uses the attribute.
   rectangular. The image formats supported as well as the precise semantics of
   how the file is used depends on the
   <A HREF="http://www.graphviz.org/doc/info/output.html">output format</A>.  For further details, see
+  <A HREF=output.html#d:image_fmts>Image Formats</A> and
   <A HREF=http://www.graphviz.org/Documentation/html/shapehowto.html#ext_image>External PostScript files</A>.
   <P>
   There is one exception to this usage.

diff --git a/doc/info/output.html b/doc/info/output.html
index 029735249fde291df863187d11d3d875022f3f5a..1f36dece00c760fba58a8e95e94892722703db83 100644 (file)
--- a/doc/info/output.html
+++ b/doc/info/output.html
@@ -541,7 +541,22 @@ mobile computing.
 <HR>
 </BODY>
 </HTML>
-
+<H1 align=CENTER><A NAME=d:image_fmts>Image Formats</A></H1>
+<HR>
+The <A HREF=attrs.html#a:image>image</A> and <A HREF=attrs.html#a:shapefile>shapefile</A> attributes specify an image file to be included
+as part of the final diagram. Not all image formats can be read. In addition,
+even if read, not all image formats can necessarily be used in a given
+output format.
+<P>
+The graph below shows what image formats can be used in which output formats,
+and the required plugins. On the left are the supported image formats. 
+On the right are the supported output formats.
+In the middle are the plugins: image loaders, renderers, drivers, arranged by 
+plugin library.  
+This presents the most general case. A given installation may not provide
+one of the plugins, in which case, that transformation is not possible.
+<BR>
+<IMG WIDTH="80%" SRC="plugins.png">
 <HR>
 <H2>Notes</H2>
 <OL TYPE="1">