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<H2><A NAME="SECTION002032000000000000000"></A><A NAME="31125"></A>
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C.3.2 <A NAME="tex2html1794"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> graphics in <I>PowerPoint</I>
</H2>

<DIV ALIGN="CENTER"><A NAME="fig:rendering"></A><A NAME="30819"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure:</STRONG>
Examples of rendered images in a <I>PowerPoint</I><A NAME="31128"></A> presentation.</CAPTION>
<TR><TD><IMG
  WIDTH="720" HEIGHT="540" ALIGN="BOTTOM" BORDER="0"
 SRC="./rendering.png"
 ALT="Image rendering"></TD></TR>
</TABLE>
</DIV>

<DIV ALIGN="CENTER"><A NAME="fig:formatpicture"></A><A NAME="30820"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure:</STRONG>
<I>PowerPoint</I><A NAME="31131"></A>'s ``Format Picture'' dialogue to set scale and rotation.</CAPTION>
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<DIV ALIGN="CENTER">   <IMG
  WIDTH="545" HEIGHT="516" ALIGN="BOTTOM" BORDER="0"
 SRC="./formatpicture.png"
 ALT="Image formatpicture">
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<P>
In Figure&nbsp;<A HREF="#fig:rendering">C.1</A> we have attempted to include Figure&nbsp;<A HREF="node143.html#fig:GMT_example_20">7.20</A> into a <I>PowerPoint</I><A NAME="31134"></A> presentation. First the <I>PostScript</I> file was converted to PDF (using <A NAME="tex2html1797"
  HREF="../man/ps2raster.html"><I><B>ps2raster</B></I></A><A NAME="31139"></A>), then loaded into <I>PowerPoint</I><A NAME="31143"></A> and the white background color was made transparent using the formatting toolbar (shown on the left side of Figure&nbsp;<A HREF="#fig:rendering">C.1</A>). Clearly, when we let <I>PowerPoint</I><A NAME="31146"></A> do the rendering, we do not get the best result:

<OL>
<LI>The anti-aliasing causes the tiles that make up the land to stand out. This is because the anti-aliasing algorithm blurs all edges, even when the tiles join seamlessly.
</LI>
<LI>The background color was assumed to be white, hence the text is ``smoothed'' using gray shades. Instead, shades of blue which would be appropriate for the background we are using.
</LI>
</OL>

<P>
On the central column of Figure&nbsp;<A HREF="#fig:rendering">C.1</A> we have included PNG versions of a portion of the same example. This shows the workings of anti-aliasing and different resolutions. All samples were obtained with <I>convert</I><A NAME="31149"></A>. The one on the top uses all default settings, resulting in an anti-aliased image at 72 dpi resolution (very much like the PDF included directly into <I>PowerPoint</I><A NAME="31152"></A>).

<P>
Just switching anti-aliasing off (middle) is clearly not an option either. It is true that we got rid of the gray blurring and the seams between the tiles, but without anti-aliasing the image becomes very blocky. The solution is to render the image at a higher resolution (e.g., 300 dpi) without anti-aliasing and then shrink the image to the appropriate size (bottom of the central column in Figure&nbsp;<A HREF="#fig:rendering">C.1</A>). The scaling, rotation as well as the selection of the transparent color can be accomplished through the ``Formatting'' tool bar and the ``Format Picture'' dialogue box of <I>PowerPoint</I><A NAME="31155"></A> (Figure&nbsp;<A HREF="#fig:formatpicture">C.2</A>), which can be found by double clicking the included image (or selecting and right-clicking or control-clicking on a one-button mouse).

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<ADDRESS>
Paul Wessel
2011-02-27
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