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

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

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>imagecolortransparent</H1
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>    (PHP 3, PHP 4, PHP 5)</P
>imagecolortransparent&nbsp;--&nbsp;将某个颜色定义为透明色</DIV
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><H2
>说明</H2
>int <B
CLASS="methodname"
>imagecolortransparent</B
> ( resource image [, int color] )<BR
></BR
><P
>&#13;   <B
CLASS="function"
>imagecolortransparent()</B
> 将
   <CODE
CLASS="parameter"
>image</CODE
> 图像中的透明色设定为
   <CODE
CLASS="parameter"
>color</CODE
>。<CODE
CLASS="parameter"
>image</CODE
>
   是 <A
HREF="function.imagecreatetruecolor.html"
><B
CLASS="function"
>imagecreatetruecolor()</B
></A
>
   返回的图像标识符，<CODE
CLASS="parameter"
>color</CODE
>
   是 <A
HREF="function.imagecolorallocate.html"
><B
CLASS="function"
>imagecolorallocate()</B
></A
> 返回的颜色标识符。
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><B
>注意: </B
>
    透明色是图像的一种属性，透明度不是颜色的属性。一旦设定了某个颜色为透明色，图像中之前画为该色的任何区域都成为透明的。
   </P
></BLOCKQUOTE
></DIV
><P
>&#13;   返回新透明色的标识符，如果省略 <CODE
CLASS="parameter"
>color</CODE
> 则返回当前透明色的标识符。
  </P
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>注意: </B
>
    透明度仅能通过 <A
HREF="function.imagecopymerge.html"
><B
CLASS="function"
>imagecopymerge()</B
></A
>
    和真彩色图像拷贝，不能用 <A
HREF="function.imagecopy.html"
><B
CLASS="function"
>imagecopy()</B
></A
> 或调色板图像。
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