PHP實現生成模糊圖片的方法示例講解

2020-03-22 17:37:06

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這篇文章主要介紹了PHP實現生成模糊圖片的方法,涉及php高斯算法實現圖片模糊功能相關實現技巧,需要的朋友可以參考下

本文實例講述了PHP實現生成模糊圖片的方法。分享給大家供大家參考，具體如下：

 ?phphtml' target='_blank'>class image_blur{ * 圖片高斯模糊（適用于png/jpg/gif格式） * @param $srcImg 原圖片 * @param $savepath 保存路徑 * @param $savename 保存名字 * @param $positon 模糊程度 *基于Martijn Frazer代碼的擴充， 感謝 Martijn Frazer public function gaussian_blur($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 保存失敗 //保存失敗 return $savefile; imagedestroy($srcImgObj); * Strong Blur * @param $gdImageResource 圖片資源 * @param $blurFactor 可選擇的模糊程度 * 可選擇的模糊程度 0使用 3默認 超過5時 極其模糊 * @return GD image 圖片資源類型 * @author Martijn Frazer, idea based on http://stackoverflow.com/a/20264482 private function blur($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 = $originalHeight; // scale way down and gradually scale back up, blurring all the way for($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);?

原圖效果：