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  28  <H3><A NAME="3_1_1">3.1.1 Verifying that you have the GD library
  29   installed</A></H3>
  30  <P> In order to make sure that the GD installed the following example
  31   would be run. The example creates a very simple image using just pure
  32   GD calls and outputs an image in PNG format. This could be considered a
  33   smoke-test to see that the GD library is available from PHP. Please
  34   note that this is an<B> absolute</B> pre-requisite in order for the
  35   JpGraph library to work at all.</P>
  36  <P> Store the code snippet below somewhere in the document root and make
  37   sure it runs correctly.<DIV class="phpscript"><CODE><FONT color="#000000">
  38   <FONT color="#0000BB">&nbsp;$im&nbsp;</FONT><FONT color="#007700">=&nbsp;@</FONT><FONT color="#0000BB">
  39  ImageCreate&nbsp;</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
  40  150</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">100</FONT><FONT
  41  color="#007700">)
  42  <BR>&nbsp;&nbsp;&nbsp;&nbsp;or&nbsp;die&nbsp;(</FONT><FONT color="#DD0000">
  43  &quot;Cannot&nbsp;create&nbsp;a&nbsp;new&nbsp;GD&nbsp;image.&quot;</FONT><FONT color="#007700">);
  44  <BR></FONT><FONT color="#0000BB">$background_color&nbsp;</FONT><FONT color="#007700">
  45  =&nbsp;</FONT><FONT color="#0000BB">ImageColorAllocate&nbsp;</FONT><FONT color="#007700">
  46  (</FONT><FONT color="#0000BB">$im</FONT><FONT color="#007700">,&nbsp;</FONT><FONT
  47  color="#0000BB">255</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">
  48  255</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">255</FONT><FONT
  49  color="#007700">);
  50  <BR></FONT><FONT color="#0000BB">$text_color&nbsp;</FONT><FONT color="#007700">
  51  =&nbsp;</FONT><FONT color="#0000BB">ImageColorAllocate&nbsp;</FONT><FONT color="#007700">
  52  (</FONT><FONT color="#0000BB">$im</FONT><FONT color="#007700">,&nbsp;</FONT><FONT
  53  color="#0000BB">233</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">
  54  14</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">91</FONT><FONT
  55  color="#007700">);
  56  <BR></FONT><FONT color="#0000BB">ImageString&nbsp;</FONT><FONT color="#007700">
  57  (</FONT><FONT color="#0000BB">$im</FONT><FONT color="#007700">,&nbsp;</FONT><FONT
  58  color="#0000BB">1</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">
  59  5</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">5</FONT><FONT
  60  color="#007700">,&nbsp;&nbsp;</FONT><FONT color="#DD0000">&quot;A&nbsp;Simple&nbsp;Text&nbsp;String&quot;</FONT><FONT
  61  color="#007700">,&nbsp;</FONT><FONT color="#0000BB">$text_color</FONT><FONT color="#007700">
  62  );
  63  <BR></FONT><FONT color="#0000BB">header&nbsp;</FONT><FONT color="#007700">(</FONT><FONT
  64  color="#DD0000">&quot;Content-type:&nbsp;image/png&quot;</FONT><FONT color="#007700">);
  65  <BR></FONT><FONT color="#0000BB">ImagePng&nbsp;</FONT><FONT color="#007700">(</FONT><FONT
  66  color="#0000BB">$im</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB">
  67  </FONT></FONT></CODE></DIV></P>
  68  <P> If the above script does not work or some error or warnings are
  69   printed on the screen then it is necessary to correct those problems
  70   before proceeding with the installation.</P>
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