mirror of
https://github.com/fofolee/uTools-Manuals.git
synced 2025-06-18 13:57:03 +08:00
46 lines
2.6 KiB
HTML
46 lines
2.6 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
|
|
<title>将某个颜色定义为透明色</title>
|
|
</head>
|
|
<body class="docs"><div id="layout">
|
|
<div id="layout-content"><div id="function.imagecolortransparent" class="refentry">
|
|
<div class="refnamediv">
|
|
<h1 class="refname">imagecolortransparent</h1>
|
|
<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagecolortransparent</span> — <span class="dc-title">将某个颜色定义为透明色</span></p>
|
|
|
|
</div>
|
|
<div class="refsect1 unknown-unknown-unknown-unknown-seealss" id="refsect1-function.imagecolortransparent-unknown-unknown-unknown-unknown-seealss">
|
|
<h3 class="title">说明</h3>
|
|
<div class="methodsynopsis dc-description">
|
|
<span class="methodname"><strong>imagecolortransparent</strong></span>
|
|
( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
|
|
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$color</code></span>
|
|
] ) : <span class="type">int</span></div>
|
|
|
|
<p class="para rdfs-comment">
|
|
<span class="function"><strong>imagecolortransparent()</strong></span> 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 <span class="function"><a href="imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>
|
|
返回的图像标识符，<code class="parameter">color</code>
|
|
是 <span class="function"><a href="imagecolorallocate.html" class="function">imagecolorallocate()</a></span> 返回的颜色标识符。
|
|
</p>
|
|
<blockquote class="note"><p><strong class="note">Note</strong>:
|
|
<p class="para">
|
|
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>
|
|
</p></blockquote>
|
|
<p class="para">
|
|
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>
|
|
<blockquote class="note"><p><strong class="note">Note</strong>:
|
|
<p class="para">
|
|
透明度仅能通过 <span class="function"><a href="imagecopymerge.html" class="function">imagecopymerge()</a></span>
|
|
和真彩色图像拷贝，不能用 <span class="function"><a href="imagecopy.html" class="function">imagecopy()</a></span> 或调色板图像。
|
|
</p>
|
|
</p></blockquote>
|
|
</div>
|
|
|
|
</div></div></div></body></html> |