Sophie: php-manual-zh-5.2.4-1mdv2008.1 noarch

php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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>imagecolorat</H1
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>    (PHP 3, PHP 4, PHP 5)</P
>imagecolorat&nbsp;--&nbsp;取得某像素的颜色索引值</DIV
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>说明</H2
>int <B
CLASS="methodname"
>imagecolorat</B
> ( resource image, int x, int y )<BR
></BR
><P
>&#13;    返回 <CODE
CLASS="parameter"
>image</CODE
> 所指定的图形中指定位置像素的颜色索引值。
   </P
><P
>&#13;    如果 PHP 编译时加上了 GD 库 2.0
    或更高的版本并且图像是真彩色图像，则本函数以整数返回该点的 RGB
    值。用移位加掩码来取得红，绿，蓝各自成分的值：
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>例 1. 取得各自的 RGB 值</B
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$im </font><font color="#007700">= </font><font color="#0000BB">ImageCreateFromPng</font><font color="#007700">(</font><font color="#DD0000">"rockym.png"</font><font color="#007700">);<br /></font><font color="#0000BB">$rgb </font><font color="#007700">= </font><font color="#0000BB">ImageColorAt</font><font color="#007700">(</font><font color="#0000BB">$im</font><font color="#007700">, </font><font color="#0000BB">100</font><font color="#007700">, </font><font color="#0000BB">100</font><font color="#007700">);<br /></font><font color="#0000BB">$r </font><font color="#007700">= (</font><font color="#0000BB">$rgb </font><font color="#007700">&gt;&gt; </font><font color="#0000BB">16</font><font color="#007700">) &amp; </font><font color="#0000BB">0xFF</font><font color="#007700">;<br /></font><font color="#0000BB">$g </font><font color="#007700">= (</font><font color="#0000BB">$rgb </font><font color="#007700">&gt;&gt; </font><font color="#0000BB">8</font><font color="#007700">) &amp; </font><font color="#0000BB">0xFF</font><font color="#007700">;<br /></font><font color="#0000BB">$b </font><font color="#007700">= </font><font color="#0000BB">$rgb </font><font color="#007700">&amp; </font><font color="#0000BB">0xFF</font><font color="#007700">;<br /></font><font color="#0000BB">?&gt;</font>
</font>
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>&#13;    参见 <A
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><B
CLASS="function"
>imagecolorset()</B
></A
> 和
    <A
HREF="function.imagecolorsforindex.html"
><B
CLASS="function"
>imagecolorsforindex()</B
></A
>。
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