1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
<?xml version='1.0' encoding='iso-8859-1'?>
<!-- $Revision: 1.7 $ -->
<refentry xml:id="function.imageconvolution" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>imageconvolution</refname>
<refpurpose>Apply a 3x3 convolution matrix, using coefficient and offset</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>imageconvolution</methodname>
<methodparam><type>resource</type><parameter>image</parameter></methodparam>
<methodparam><type>array</type><parameter>matrix</parameter></methodparam>
<methodparam><type>float</type><parameter>div</parameter></methodparam>
<methodparam><type>float</type><parameter>offset</parameter></methodparam>
</methodsynopsis>
<para>
Applies a convolution matrix on the image, using the given coefficient and
offset.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
&gd.image.description;
<varlistentry>
<term><parameter>matrix</parameter></term>
<listitem>
<para>
A 3x3 matrix: an array of three arrays of three floats.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>div</parameter></term>
<listitem>
<para>
The divisor of the result of the convolution, used for normalization.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>offset</parameter></term>
<listitem>
<para>
Color offset.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>Embossing the PHP.net logo</title>
<programlisting role="php">
<![CDATA[
<?php
$image = imagecreatefromgif('http://www.php.net/images/php.gif');
$emboss = array(array(2, 0, 0), array(0, -1, 0), array(0, 0, -1));
imageconvolution($image, $emboss, 1, 127);
header('Content-Type: image/png');
imagepng($image, null, 9);
?>
]]>
</programlisting>
&example.outputs;
<mediaobject>
<imageobject>
<imagedata fileref="figures/image.imageconvolution_emboss.png"/>
</imageobject>
</mediaobject>
</example>
<example>
<title>Gaussian blur</title>
<programlisting role="php">
<![CDATA[
<?php
$image = imagecreatetruecolor(180,40);
// Writes the text and apply a gaussian blur on the image
imagestring($image, 5, 10, 8, 'Gaussian Blur Text', 0x00ff00);
$gaussian = array(array(1.0, 2.0, 1.0), array(2.0, 4.0, 2.0), array(1.0, 2.0, 1.0));
imageconvolution($image, $gaussian, 16, 0);
// Rewrites the text for comparison
imagestring($image, 5, 10, 18, 'Gaussian Blur Text', 0x00ff00);
header('Content-Type: image/png');
imagepng($image, null, 9);
?>
]]>
</programlisting>
&example.outputs;
<mediaobject>
<imageobject>
<imagedata fileref="figures/image.imageconvolution_gaussian.png"/>
</imageobject>
</mediaobject>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
¬e.bundled.gd;
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>imagefilter</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"../../../../manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->
|
