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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Adding watermarks to images using alpha channels</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="image.examples.html">Examples</a></div> <div class="next" style="text-align: right; float: right;"><a href="image.examples.merged-watermark.html">Using imagecopymerge to create a translucent watermark</a></div> <div class="up"><a href="image.examples.html">Examples</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="image.examples-watermark" class="section"> <p class="para"> <div class="example"> <p><b>Example #1 Adding watermarks to images using alpha channels</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// Load the stamp and the photo to apply the watermark to<br /></span><span style="color: #0000BB">$stamp </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatefrompng</span><span style="color: #007700">(</span><span style="color: #DD0000">'stamp.png'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatefromjpeg</span><span style="color: #007700">(</span><span style="color: #DD0000">'photo.jpeg'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Set the margins for the stamp and get the height/width of the stamp image<br /></span><span style="color: #0000BB">$marge_right </span><span style="color: #007700">= </span><span style="color: #0000BB">10</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$marge_bottom </span><span style="color: #007700">= </span><span style="color: #0000BB">10</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$sx </span><span style="color: #007700">= </span><span style="color: #0000BB">imagesx</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$sy </span><span style="color: #007700">= </span><span style="color: #0000BB">imagesy</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Copy the stamp image onto our photo using the margin offsets and the photo <br />// width to calculate positioning of the stamp. <br /></span><span style="color: #0000BB">imagecopy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">$stamp</span><span style="color: #007700">, </span><span style="color: #0000BB">imagesx</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">) - </span><span style="color: #0000BB">$sx </span><span style="color: #007700">- </span><span style="color: #0000BB">$marge_right</span><span style="color: #007700">, </span><span style="color: #0000BB">imagesy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">) - </span><span style="color: #0000BB">$sy </span><span style="color: #007700">- </span><span style="color: #0000BB">$marge_bottom</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">imagesx</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">), </span><span style="color: #0000BB">imagesy</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// Output and free memory<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-type: image/png'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagepng</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="mediaobject"> <div class="imageobject"> <img src="figures/image.watermarks.png" /> </div> </div> </div> This example is a common way to add watermarks and stamps to photos and copyrighted images. Note that the presence of an alpha channel in the stamp image as the text is anti-aliased. This is preserved during copying. </p> </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="image.examples.html">Examples</a></div> <div class="next" style="text-align: right; float: right;"><a href="image.examples.merged-watermark.html">Using imagecopymerge to create a translucent watermark</a></div> <div class="up"><a href="image.examples.html">Examples</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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