这篇文章主要介绍了php实现图片局部打马赛克的方法,实例分析了php针对图片操作的技巧,非常具有实用价值,需要的朋友可以参考下
本文实例讲述了php实现图片局部打马赛克的方法。分享给大家供大家参考。具体分析如下:
原理:
对图片中选定区域的每一像素,增加若干宽度及高度,生成矩型。而每一像素的矩型重叠在一起,,就形成了马赛克效果。
本例使用GD库的imagecolorat获取像素颜色,使用imagefilledrectangle画矩型。
效果图如下所示:
代码如下:
复制代码 代码如下:
/** 图片局部打马赛克
* @param String $source 原图
* @param Stirng $dest 生成的图片
* @param int $x1 起点横坐标
* @param int $y1 起点纵坐标
* @param int $x2 终点横坐标
* @param int $y2 终点纵坐标
* @param int $deep 深度,数字越大越模糊
* @return boolean
*/
function imageMosaics($source, $dest, $x1, $y1, $x2, $y2, $deep){
// 判断原图是否存在
if(!file_exists($source)){
return false;
}
// 获取原图信息
list($owidth, $oheight, $otype) = getimagesize($source);
// 判断区域是否超出图片
if($x1>$owidth || $x1$owidth || $x2$oheight || $y1$oheight || $y2
return false;
}
switch($otype){
case 1: $source_img = imagecreatefromgif($source); break;
case 2: $source_img = imagecreatefromjpeg($source); break;
case 3: $source_img = imagecreatefrompng($source); break;
default:
return false;
}
// 打马赛克
for($x=$x1; $x
for($y=$y1; $y
$color = imagecolorat($source_img, $x+round($deep/2), $y+round($deep/2));
imagefilledrectangle($source_img, $x, $y, $x+$deep, $y+$deep, $color);
}
}
// 生成图片
switch($otype){
case 1: imagegif($source_img, $dest); break;
case 2: imagejpeg($source_img, $dest); break;
case 3: imagepng($source_img, $dest); break;
}
return is_file($dest)? true : false;
}
$source = 'source.jpg';
$dest = 'dest.jpg';
$flag = imageMosaics($source, $dest, 176, 98, 273, 197, 4);
echo '';
echo '';
?>
完整实例代码点击此处本站下载。
希望本文所述对大家的php程序设计有所帮助。

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