学习使用php实现生成模糊图片的方法类整理
<?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 $positon 模糊程度* @blurFactor的值代表模糊程度*基于Martijn Frazer代码的扩充， 感谢 Martijn Frazer*/public function gaussian_blur($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 $blurFactor 可选择的模糊程度* 可选择的模糊程度 0使用 3默认 超过5时 极其模糊* @return GD image 图片资源类型* @author Martijn Frazer, idea based on /a/20264482*/private function blur($gdImageResource, $blurFactor = 3){// blurFactor has to be an integer$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 = $originalHeight;// scale way down and gradually scale back up, blurring all the wayfor ($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, $prevHeight);// apply blur filterimagefilter($nextImage, IMG_FILTER_GAUSSIAN_BLUR);// now the new image becomes the previous image for the next step$prevImage = $nextImage;$prevWidth = $nextWidth;$prevHeight = $nextHeight;}// scale back to original size and blur one more timeimagecopyresized($gdImageResource, $nextImage,0, 0, 0, 0, $originalWidth, $originalHeight, $nextWidth, $nextHeight);imagefilter($gdImageResource, IMG_FILTER_GAUSSIAN_BLUR);// clean upimagedestroy($prevImage);// return resultreturn $gdImageResource;}private function image_create_from_ext($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("./wenku_pic.jpg", null, 'wenku_pic_mohu.jpg', 3);?>
原图效果：
生成模糊图片后的效果：
