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<H3><A NAME="3_1_2">3.1.2 Verifying that you have GD2 installed</A></H3>
<P> To access the more advanced features of JpGraph needs the GD 2.x
 library. This will allow the use of features such as alpha-blending and
 trucolor images.</P>
<P> The GD 2.x library is included in all standard PHP versions from
 4.2.x and above. To make sure that the GD 2.x library is installed the
 following script must be working.<DIV class="phpscript"><CODE><FONT color="#000000">
 <FONT color="#0000BB">&nbsp;$im&nbsp;</FONT><FONT color="#007700">=&nbsp;</FONT><FONT color="#0000BB">
imagecreatetruecolor&nbsp;</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
300</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">200</FONT><FONT
color="#007700">);&nbsp;
<BR></FONT><FONT color="#0000BB">$black&nbsp;</FONT><FONT color="#007700">=&nbsp;</FONT><FONT
color="#0000BB">imagecolorallocate&nbsp;</FONT><FONT color="#007700">(</FONT><FONT
color="#0000BB">$im</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">
0</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">0</FONT><FONT
color="#007700">,&nbsp;</FONT><FONT color="#0000BB">0</FONT><FONT color="#007700">
);&nbsp;
<BR></FONT><FONT color="#0000BB">$white&nbsp;</FONT><FONT color="#007700">=&nbsp;</FONT><FONT
color="#0000BB">imagecolorallocate&nbsp;</FONT><FONT color="#007700">(</FONT><FONT
color="#0000BB">$im</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">
255</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">255</FONT><FONT
color="#007700">,&nbsp;</FONT><FONT color="#0000BB">255</FONT><FONT color="#007700">
);&nbsp;
<BR>
<BR></FONT><FONT color="#0000BB">imagefilledrectangle</FONT><FONT color="#007700">
(</FONT><FONT color="#0000BB">$im</FONT><FONT color="#007700">,</FONT><FONT
color="#0000BB">0</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
0</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">399</FONT><FONT
color="#007700">,</FONT><FONT color="#0000BB">99</FONT><FONT color="#007700">
,</FONT><FONT color="#0000BB">$white</FONT><FONT color="#007700">);&nbsp;
<BR></FONT><FONT color="#0000BB">imagerectangle</FONT><FONT color="#007700">
(</FONT><FONT color="#0000BB">$im</FONT><FONT color="#007700">,</FONT><FONT
color="#0000BB">20</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
20</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">250</FONT><FONT
color="#007700">,</FONT><FONT color="#0000BB">190</FONT><FONT color="#007700">
,</FONT><FONT color="#0000BB">$black</FONT><FONT color="#007700">);&nbsp;
<BR>
<BR></FONT><FONT color="#0000BB">header&nbsp;</FONT><FONT color="#007700">(</FONT><FONT
color="#DD0000">&quot;Content-type:&nbsp;image/png&quot;</FONT><FONT color="#007700">
);&nbsp;
<BR></FONT><FONT color="#0000BB">imagepng&nbsp;</FONT><FONT color="#007700">(</FONT><FONT
color="#0000BB">$im</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB">
</FONT></FONT></CODE></DIV></P>
<P> After running this script you should now see a black rectangle in
 your browser.</P>
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