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php Partial mosaic of pictures
Principle:
Yes For each pixel of the selected area in the image, increase the width and height to create a rectangle. The rectangles of each pixel overlap to form a mosaic effect.
This example uses imagecolorat of the GD library to obtain the pixel color, and imagefilledrectangle to draw a rectangle.
Rendering:
##The code is as follows:
<?php /** 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<0 || $x2>$owidth || $x2<0 || $y1>$oheight || $y1<0 || $y2>$oheight || $y2<0){ return false; } switch($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; $x<$x2; $x=$x+$deep){ for($y=$y1; $y<$y2; $y=$y+$deep){ $color = imagecolorat($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, $dest, 176, 98, 273, 197, 4); echo '<img src="'.$source.'">'; echo '<img src="'.$dest.'">'; ?>This article explains how to partially mosaic images through PHP. For more related content, please pay attention to the PHP Chinese website. Related recommendations:
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