欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  后端开发

PHP如何实现生成模糊图片

程序员文章站 2022-05-25 11:11:10
...
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。


<?php
class 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 $blurFactor   可选择的模糊程度
 * 可选择的模糊程度 0使用 3默认 超过5时 极其模糊
 * @return GD image 图片资源类型
 * @author Martijn Frazer, idea based on http://*.com/a/20264482
 */
 private function blur($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);
?>

原图效果:

PHP如何实现生成模糊图片

生成模糊图片后的效果:

PHP如何实现生成模糊图片

大家学会了吗?赶紧动手尝试一下吧。

相关推荐:

css3模糊图片_html/css_WEB-ITnose

js图片模糊切换显示特效的方法_javascript技巧

css实现的图片模糊效果_javascript技巧

以上就是PHP如何实现生成模糊图片的详细内容,更多请关注其它相关文章!

相关标签: php 图片 模糊