mirror of
https://github.com/fofolee/uTools-Manuals.git
synced 2025-06-20 07:06:50 +08:00
259 lines
9.0 KiB
HTML
259 lines
9.0 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>Crop an image automatically using one of the available modes</title>
|
|
</head>
|
|
<body class="docs"><div id="layout">
|
|
<div id="layout-content"><div id="function.imagecropauto" class="refentry">
|
|
<div class="refnamediv">
|
|
<h1 class="refname">imagecropauto</h1>
|
|
<p class="verinfo">(PHP 5 >= 5.5.0, PHP 7)</p><p class="refpurpose"><span class="refname">imagecropauto</span> — <span class="dc-title">Crop an image automatically using one of the available modes</span></p>
|
|
|
|
</div>
|
|
|
|
<div class="refsect1 description" id="refsect1-function.imagecropauto-description">
|
|
<h3 class="title">说明</h3>
|
|
<div class="methodsynopsis dc-description">
|
|
<span class="methodname"><strong>imagecropauto</strong></span>
|
|
( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
|
|
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$mode</code><span class="initializer"> = <strong><code>IMG_CROP_DEFAULT</code></strong></span></span>
|
|
[, <span class="methodparam"><span class="type">float</span> <code class="parameter">$threshold</code><span class="initializer"> = .5</span></span>
|
|
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$color</code><span class="initializer"> = -1</span></span>
|
|
]]] ) : <span class="type">resource</span></div>
|
|
|
|
<p class="para rdfs-comment">
|
|
Automatically crops an image according to the given
|
|
<code class="parameter">mode</code>.
|
|
</p>
|
|
</div>
|
|
|
|
|
|
<div class="refsect1 parameters" id="refsect1-function.imagecropauto-parameters">
|
|
<h3 class="title">参数</h3>
|
|
<dl>
|
|
|
|
<dt>
|
|
<code class="parameter">image</code></dt>
|
|
|
|
<dd>
|
|
<p class="para">由图象创建函数(例如<span class="function"><a href="imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>)返回的图象资源。</p></dd>
|
|
|
|
|
|
<dt>
|
|
<code class="parameter">mode</code></dt>
|
|
|
|
<dd>
|
|
|
|
<p class="para">
|
|
One of the following constants:
|
|
</p>
|
|
<dl>
|
|
|
|
|
|
<dt>
|
|
<strong><code>IMG_CROP_DEFAULT</code></strong></dt>
|
|
|
|
<dd>
|
|
|
|
<span class="simpara">
|
|
Same as <strong><code>IMG_CROP_TRANSPARENT</code></strong>.
|
|
Before PHP 7.4.0, the bundled libgd fell back to <strong><code>IMG_CROP_SIDES</code></strong>,
|
|
if the image had no transparent color.
|
|
</span>
|
|
</dd>
|
|
|
|
|
|
|
|
<dt>
|
|
<strong><code>IMG_CROP_TRANSPARENT</code></strong></dt>
|
|
|
|
<dd>
|
|
|
|
<span class="simpara">
|
|
Crops out a transparent background.
|
|
</span>
|
|
</dd>
|
|
|
|
|
|
|
|
<dt>
|
|
<strong><code>IMG_CROP_BLACK</code></strong></dt>
|
|
|
|
<dd>
|
|
|
|
<span class="simpara">
|
|
Crops out a black background.
|
|
</span>
|
|
</dd>
|
|
|
|
|
|
|
|
<dt>
|
|
<strong><code>IMG_CROP_WHITE</code></strong></dt>
|
|
|
|
<dd>
|
|
|
|
<span class="simpara">
|
|
Crops out a white background.
|
|
</span>
|
|
</dd>
|
|
|
|
|
|
|
|
<dt>
|
|
<strong><code>IMG_CROP_SIDES</code></strong></dt>
|
|
|
|
<dd>
|
|
|
|
<span class="simpara">
|
|
Uses the 4 corners of the image to attempt to detect the background to
|
|
crop.
|
|
</span>
|
|
</dd>
|
|
|
|
|
|
|
|
<dt>
|
|
<strong><code>IMG_CROP_THRESHOLD</code></strong></dt>
|
|
|
|
<dd>
|
|
|
|
<span class="simpara">
|
|
Crops an image using the given <code class="parameter">threshold</code> and
|
|
<code class="parameter">color</code>.
|
|
</span>
|
|
</dd>
|
|
|
|
|
|
</dl>
|
|
|
|
</dd>
|
|
|
|
|
|
|
|
<dt>
|
|
<code class="parameter">threshold</code></dt>
|
|
|
|
<dd>
|
|
|
|
<p class="para">
|
|
Specifies the tolerance in percent to be used while comparing the image
|
|
color and the color to crop. The method used to calculate the color
|
|
difference is based on the color distance in the RGB(a) cube.
|
|
</p>
|
|
<p class="para">
|
|
Used only in <strong><code>IMG_CROP_THRESHOLD</code></strong> mode.
|
|
</p>
|
|
<blockquote class="note"><p><strong class="note">Note</strong>:
|
|
<span class="simpara">
|
|
Before PHP 7.4.0, the bundled libgd used a somewhat different algorithm,
|
|
so the same <code class="parameter">threshold</code> yielded different results
|
|
for system and bundled libgd.
|
|
</span>
|
|
</p></blockquote>
|
|
</dd>
|
|
|
|
|
|
|
|
<dt>
|
|
<code class="parameter">color</code></dt>
|
|
|
|
<dd>
|
|
|
|
<p class="para">
|
|
Either an RGB color value or a palette index.
|
|
</p>
|
|
<p class="para">
|
|
Used only in <strong><code>IMG_CROP_THRESHOLD</code></strong> mode.
|
|
</p>
|
|
</dd>
|
|
|
|
|
|
</dl>
|
|
|
|
</div>
|
|
|
|
|
|
<div class="refsect1 returnvalues" id="refsect1-function.imagecropauto-returnvalues">
|
|
<h3 class="title">返回值</h3>
|
|
<p class="para">
|
|
Returns a cropped image resource on success 或者在失败时返回 <strong><code>FALSE</code></strong>.
|
|
If the complete image was cropped, <span class="function"><a href="imagecrop.html" class="function">imagecrop()</a></span> returns <strong><code>FALSE</code></strong>.
|
|
</p>
|
|
</div>
|
|
|
|
|
|
<div class="refsect1 changelog" id="refsect1-function.imagecropauto-changelog">
|
|
<h3 class="title">更新日志</h3>
|
|
<table class="doctable informaltable">
|
|
|
|
<thead>
|
|
<tr>
|
|
<th>版本</th>
|
|
<th>说明</th>
|
|
</tr>
|
|
|
|
</thead>
|
|
|
|
<tbody class="tbody">
|
|
<tr>
|
|
<td>7.4.0</td>
|
|
<td>
|
|
The behavior of imagecropauto() in the bundled libgd has been synced with
|
|
that of system libgd: <strong><code>IMG_CROP_DEFAULT</code></strong> no longer falls
|
|
back to <strong><code>IMG_CROP_SIDES</code></strong> and threshold-cropping now uses
|
|
the same algorithm as system libgd.
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>7.4.0</td>
|
|
<td>
|
|
The default value of <code class="parameter">mode</code> has been changed to
|
|
<strong><code>IMG_CROP_AUTO</code></strong>. Formerly, the default value has been
|
|
<em>-1</em> which corresponds to <strong><code>IMG_CROP_DEFAULT</code></strong>,
|
|
but passing <em>-1</em> is now deprecated.
|
|
</td>
|
|
</tr>
|
|
|
|
</tbody>
|
|
|
|
</table>
|
|
|
|
</div>
|
|
|
|
|
|
<div class="refsect1 examples" id="refsect1-function.imagecropauto-examples">
|
|
<h3 class="title">范例</h3>
|
|
<p class="para">
|
|
<div class="example" id="example-3691">
|
|
<p><strong>Example #1 Proper handling of auto-cropping</strong></p>
|
|
<div class="example-contents"><p>
|
|
As noted in the return value section, <span class="function"><strong>imagecropauto()</strong></span>
|
|
returns <strong><code>FALSE</code></strong> if the whole image
|
|
was cropped. In this example we have an image resource
|
|
<em>$im</em> which should be automatically cropped only if there
|
|
is something to crop; otherwise we want to proceed with the original image.
|
|
</p></div>
|
|
<div class="example-contents">
|
|
<div class="phpcode"><pre><span style="color: #000000">
|
|
<span style="color: #0000BB"><?php<br />$cropped </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecropauto</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">IMG_CROP_DEFAULT</span><span style="color: #007700">);<br />if (</span><span style="color: #0000BB">$cropped </span><span style="color: #007700">!== </span><span style="color: #0000BB">false</span><span style="color: #007700">) { </span><span style="color: #FF8000">// in case a new image resource was returned<br /> </span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">); </span><span style="color: #FF8000">// we destroy the original image<br /> </span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">$cropped</span><span style="color: #007700">; </span><span style="color: #FF8000">// and assign the cropped image to $im<br /></span><span style="color: #007700">}<br /></span><span style="color: #0000BB">?></span>
|
|
</span>
|
|
</pre></div>
|
|
</div>
|
|
|
|
</div>
|
|
</p>
|
|
</div>
|
|
|
|
|
|
<div class="refsect1 seealso" id="refsect1-function.imagecropauto-seealso">
|
|
<h3 class="title">参见</h3>
|
|
<ul class="simplelist">
|
|
<li class="member"><span class="function"><a href="imagecrop.html" class="function" rel="rdfs-seeAlso">imagecrop()</a> - Crop an image to the given rectangle</span></li>
|
|
</ul>
|
|
</div>
|
|
|
|
|
|
</div></div></div></body></html> |