本文主要介绍了PHP实现生成模糊图片的方法,涉及php高斯算法实现图片模糊功能相关实现技巧,需要的朋友可以参考下，希望能帮助到大家。
<?phpclass image_blur{/** * 图片高斯模糊（适用于png/jpg/gif格式） * @param $srcImg 原图片 * @param $savepath 保存路径 * @param $savename 保存名字 * @param $positon 模糊程度 * *基于Martijn Frazer代码的扩充， 感谢 Martijn Frazer */ public function gaussian_blur($srcImg,$savepath=null,$savename=null,$blurFactor=3){ $gdImageResource=$this->image_create_from_ext($srcImg); $srcImgObj=$this->blur($gdImageResource,$blurFactor); $temp = pathinfo($srcImg); $name = $temp['basename']; $path = $temp['dirname']; $exte = $temp['extension']; $savename = $savename ? $savename : $name; $savepath = $savepath ? $savepath : $path; $savefile = $savepath .'/'. $savename; $srcinfo = @getimagesize($srcImg); switch ($srcinfo[2]) { case 1: imagegif($srcImgObj, $savefile); break; case 2: imagejpeg($srcImgObj, $savefile); break; case 3: imagepng($srcImgObj, $savefile); break; default: return '保存失败'; //保存失败 } return $savefile; imagedestroy($srcImgObj); } /** * Strong Blur * * @param $gdImageResource 图片资源 * @param $blurFactor 可选择的模糊程度 * 可选择的模糊程度 0使用 3默认 超过5时 极其模糊 * @return GD image 图片资源类型 * @author Martijn Frazer, idea based on http://stackoverflow.com/a/20264482 */ private function blur($gdImageResource, $blurFactor = 3) { // blurFactor has to <mark style="color:transparent">本文来源gaodaimacom搞#^代%!码&网*</mark><pre>搞代gaodaima码
be an integer $blurFactor = round($blurFactor); $originalWidth = imagesx($gdImageResource); $originalHeight = imagesy($gdImageResource); $smallestWidth = ceil($originalWidth * pow(0.5, $blurFactor)); $smallestHeight = ceil($originalHeight * pow(0.5, $blurFactor)); // for the first run, the previous image is the original input $prevImage = $gdImageResource; $prevWidth = $originalWidth; $prevHeight = $originalHeight; // scale way down and gradually scale back up, blurring all the way for($i = 0; $i < $blurFactor; $i += 1) { // determine dimensions of next image $nextWidth = $smallestWidth * pow(2, $i); $nextHeight = $smallestHeight * pow(2, $i); // resize previous image to next size $nextImage = imagecreatetruecolor($nextWidth, $nextHeight); imagecopyresized($nextImage, $prevImage, 0, 0, 0, 0, $nextWidth, $nextHeight, $prevWidth, $prevHeight); // apply blur filter imagefilter($nextImage, IMG_FILTER_GAUSSIAN_BLUR); // now the new image becomes the previous image for the next step $prevImage = $nextImage; $prevWidth = $nextWidth; $prevHeight = $nextHeight; } // scale back to original size and blur one more time imagecopyresized($gdImageResource, $nextImage, 0, 0, 0, 0, $originalWidth, $originalHeight, $nextWidth, $nextHeight); imagefilter($gdImageResource, IMG_FILTER_GAUSSIAN_BLUR); // clean up imagedestroy($prevImage); // return result return $gdImageResource; } private function image_create_from_ext($imgfile) { $info = getimagesize($imgfile); $im = null; switch ($info[2]) { case 1: $im=imagecreatefromgif($imgfile); break; case 2: $im=imagecreatefromjpeg($imgfile); break; case 3: $im=imagecreatefrompng($imgfile); break; } return $im; }}$image_blur = new image_blur();$image_blur->gaussian_blur("./1.jpg",null,null,3);?>
原图效果：
生成模糊图片后的效果：
大家学会了吗？赶紧动手尝试一下吧。
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