<?xml version="1.0" encoding="utf-8"?>

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<refentry xml:id="function.imagecolorresolve" xmlns="http://docbook.org/ns/docbook">

<refnamediv>

<refname>imagecolorresolve</refname>

<refpurpose>取得指定颜色的索引值或有可能得到的最接近的替代值</refpurpose>

</refnamediv>

<refsect1 role="description">

&reftitle.description;

<methodsynopsis>

<type>int</type><methodname>imagecolorresolve</methodname>

<methodparam><type>GdImage</type><parameter>image</parameter></methodparam>

<methodparam><type>int</type><parameter>red</parameter></methodparam>

<methodparam><type>int</type><parameter>green</parameter></methodparam>

<methodparam><type>int</type><parameter>blue</parameter></methodparam>

</methodsynopsis>

<para>

本函数可以保证对所请求的颜色返回颜色索引，要么是准确的颜色要么是最接近的颜色。

</para>

<para>&gd.image.colors;</para>

</refsect1>

<refsect1 role="parameters">

&reftitle.parameters;

<para>

<variablelist>

&gd.image.description;

<varlistentry>

<term><parameter>red</parameter></term>

<listitem>

<para>&gd.value.red;</para>

</listitem>

</varlistentry>

<varlistentry>

<term><parameter>green</parameter></term>

<listitem>

<para>&gd.value.green;</para>

</listitem>

</varlistentry>

<varlistentry>

<term><parameter>blue</parameter></term>

<listitem>

<para>&gd.value.blue;</para>

</listitem>

</varlistentry>

</variablelist>

</para>

</refsect1>

<refsect1 role="returnvalues">

&reftitle.returnvalues;

<para>

返回颜色索引值。

</para>

</refsect1>

<refsect1 role="changelog">

&reftitle.changelog;

<informaltable>

<tgroup cols="2">

<thead>

<row>

<entry>&Version;</entry>

<entry>&Description;</entry>

</row>

</thead>

<tbody>

&gd.changelog.image-param;

</tbody>

</tgroup>

</informaltable>

</refsect1>

<refsect1 role="examples">

&reftitle.examples;

<example>

<title>使用 <function>imagecoloresolve</function> 从图像中获取颜色</title>

<programlisting role="php">

<![CDATA[

<?php

// 加载图像

$im = imagecreatefromgif('phplogo.gif');

// 从图像中获取最接近的颜色

$colors = array();

$colors[] = imagecolorresolve($im, 255, 255, 255);

$colors[] = imagecolorresolve($im, 0, 0, 200);

// 输出

print_r($colors);

?>

]]>

</programlisting>

&example.outputs.similar;

<screen>

<![CDATA[

Array

(

[0] => 89

[1] => 85

)

]]>

</screen>

</example>

</refsect1>

<refsect1 role="seealso">

&reftitle.seealso;

<simplelist>

<member><function>imagecolorclosest</function></member>

</simplelist>

</refsect1>

</refentry>

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