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<H3><A NAME="3_1_1">3.1.1 Verifying that you have the GD library
 installed</A></H3>
<P> In order to make sure that the GD installed the following example
 would be run. The example creates a very simple image using just pure
 GD calls and outputs an image in PNG format. This could be considered a
 smoke-test to see that the GD library is available from PHP. Please
 note that this is an<B> absolute</B> pre-requisite in order for the
 JpGraph library to work at all.</P>
<P> Store the code snippet below somewhere in the document root and make
 sure it runs correctly.<DIV class="phpscript"><CODE><FONT color="#000000">
 <FONT color="#0000BB">&nbsp;$im&nbsp;</FONT><FONT color="#007700">=&nbsp;@</FONT><FONT color="#0000BB">
ImageCreate&nbsp;</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
150</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">100</FONT><FONT
color="#007700">)
<BR>&nbsp;&nbsp;&nbsp;&nbsp;or&nbsp;die&nbsp;(</FONT><FONT color="#DD0000">
&quot;Cannot&nbsp;create&nbsp;a&nbsp;new&nbsp;GD&nbsp;image.&quot;</FONT><FONT color="#007700">);
<BR></FONT><FONT color="#0000BB">$background_color&nbsp;</FONT><FONT color="#007700">
=&nbsp;</FONT><FONT color="#0000BB">ImageColorAllocate&nbsp;</FONT><FONT color="#007700">
(</FONT><FONT color="#0000BB">$im</FONT><FONT color="#007700">,&nbsp;</FONT><FONT
color="#0000BB">255</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">
255</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">255</FONT><FONT
color="#007700">);
<BR></FONT><FONT color="#0000BB">$text_color&nbsp;</FONT><FONT color="#007700">
=&nbsp;</FONT><FONT color="#0000BB">ImageColorAllocate&nbsp;</FONT><FONT color="#007700">
(</FONT><FONT color="#0000BB">$im</FONT><FONT color="#007700">,&nbsp;</FONT><FONT
color="#0000BB">233</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">
14</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">91</FONT><FONT
color="#007700">);
<BR></FONT><FONT color="#0000BB">ImageString&nbsp;</FONT><FONT color="#007700">
(</FONT><FONT color="#0000BB">$im</FONT><FONT color="#007700">,&nbsp;</FONT><FONT
color="#0000BB">1</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">
5</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">5</FONT><FONT
color="#007700">,&nbsp;&nbsp;</FONT><FONT color="#DD0000">&quot;A&nbsp;Simple&nbsp;Text&nbsp;String&quot;</FONT><FONT
color="#007700">,&nbsp;</FONT><FONT color="#0000BB">$text_color</FONT><FONT color="#007700">
);
<BR></FONT><FONT color="#0000BB">header&nbsp;</FONT><FONT color="#007700">(</FONT><FONT
color="#DD0000">&quot;Content-type:&nbsp;image/png&quot;</FONT><FONT color="#007700">);
<BR></FONT><FONT color="#0000BB">ImagePng&nbsp;</FONT><FONT color="#007700">(</FONT><FONT
color="#0000BB">$im</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB">
</FONT></FONT></CODE></DIV></P>
<P> If the above script does not work or some error or warnings are
 printed on the screen then it is necessary to correct those problems
 before proceeding with the installation.</P>
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