📄 image.examples.merged-watermark.html
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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>Using imagecopymerge to create a translucent watermark</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="ref.image.html">GD Functions</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.merged-watermark" class="section"> <p class="para"> <div class="example"> <p><b>Example #1 Using <a href="function.imagecopymerge.html" class="function">imagecopymerge()</a> to create a translucent watermark</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">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatefromjpeg</span><span style="color: #007700">(</span><span style="color: #DD0000">'photo.jpeg'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// First we create our stamp image manually from GD<br /></span><span style="color: #0000BB">$stamp </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">70</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagefilledrectangle</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">,</span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">99</span><span style="color: #007700">, </span><span style="color: #0000BB">99</span><span style="color: #007700">, </span><span style="color: #0000BB">0x0000FF</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagefilledrectangle</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">, </span><span style="color: #0000BB">9</span><span style="color: #007700">,</span><span style="color: #0000BB">9</span><span style="color: #007700">, </span><span style="color: #0000BB">90</span><span style="color: #007700">,</span><span style="color: #0000BB">60</span><span style="color: #007700">, </span><span style="color: #0000BB">0xFFFFFF</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatefromjpeg</span><span style="color: #007700">(</span><span style="color: #DD0000">'photo.jpeg'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagestring</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">, </span><span style="color: #0000BB">5</span><span style="color: #007700">, </span><span style="color: #0000BB">20</span><span style="color: #007700">, </span><span style="color: #0000BB">20</span><span style="color: #007700">, </span><span style="color: #DD0000">'libGD'</span><span style="color: #007700">, </span><span style="color: #0000BB">0x0000FF</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagestring</span><span style="color: #007700">(</span><span style="color: #0000BB">$stamp</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #0000BB">20</span><span style="color: #007700">, </span><span style="color: #0000BB">40</span><span style="color: #007700">, </span><span style="color: #DD0000">'(c) 2007-8'</span><span style="color: #007700">, </span><span style="color: #0000BB">0x0000FF</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Set the margins for the stamp and get the height/width of the stamp image<br /></span><span style="color: #0000BB">$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">$stamp</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Merge the stamp onto our photo with an opacity (transparency) of 50%<br /></span><span style="color: #0000BB">imagecopymerge</span><span style="color: #007700">(</span><span style="color: #0000BB">$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">$stamp</span><span style="color: #007700">), </span><span style="color: #0000BB">50</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Save the image to file and free memory<br /></span><span style="color: #0000BB">imagepng</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #DD0000">'photo_stamp.png'</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 /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> <div class="mediaobject"> <div class="imageobject"> <img src="figures/image.watermark-merged.png" /> </div> </div> </div> This example uses <a href="function.imagecopymerge.html" class="function">imagecopymerge()</a> to merge the stamp with our original image. Using this we can set the opacity of our stamp - in our example we've set it to 50% opacity (another term for transparency). In practice this would be useful in copyright protection as semi-transparent watermarks are hard to remove yet allow viewers to see the image. </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="ref.image.html">GD Functions</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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