r.in.png/r.out.png manuals: descriptions expanded

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@73645 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.in.png/r.in.png.html

@@ -1,13 +1,20 @@
 <h2>DESCRIPTION</h2>
 
-<em>r.in.png</em> imports a PNG image as a GRASS raster map.
+<em>r.in.png</em> imports a non-georeferenced Portable Network Graphics (PNG) image
+as a GRASS raster map. Georeferencing .wld files are not supported, for that
+<em>r.import</em> can be used.
+
+<h2>NOTES</h2>
+
+In order to assign georeferencing after import use <em>r.region</em>.
 
 <h2>SEE ALSO</h2>
 
 <em>
 <a href="r.import.html">r.import</a>,
 <a href="r.in.gdal.html">r.in.gdal</a>,
-<a href="r.out.png.html">r.out.png</a>
+<a href="r.out.png.html">r.out.png</a>,
+<a href="r.region.html">r.region</a>
 </em>
 
 <h2>AUTHORS</h2>

raster/r.out.png/r.out.png.html

@@ -1,13 +1,15 @@
 <h2>DESCRIPTION</h2>
 
-<em>r.out.png</em> exports a GRASS raster map in non-georeferenced PNG image
-format, respecting the current region resolution and bounds.
+<em>r.out.png</em> exports a GRASS raster map in non-georeferenced
+Portable Network Graphics (PNG) image format, respecting the current
+region resolution and bounds.
 
-<p>Optionally the user can choose to export a World File to provide basic
+<p>
+Optionally the user can choose to export a World File (.wld) to provide basic
 georeferencing support. When used with the transparency flag this can
 create images useful for KML, TMS, or WMS overlays. (e.g. for use in
-Google Earth or as OpenLayers tiles) If output is to stdout, the world
-file will be called <tt>png_map.wld</tt>.
+Google Earth or as OpenLayers tiles) If output is redirected to stdout,
+the world file will be called <tt>png_map.wld</tt>.
 
 
 <h2>SEE ALSO</h2>
@@ -16,7 +18,7 @@ file will be called <tt>png_map.wld</tt>.
 <a href="r.out.gdal.html">r.out.gdal</a>,
 <a href="r.out.ppm.html">r.out.ppm</a>,
 <a href="r.out.ascii.html">r.out.ascii</a>,
-<a href="r.in.png.html">r.in.png</a>
+<a href="r.import.html">r.import</a>
 </em>