php-模糊图像的最佳方法 [英] php - Best way to blur images

问题描述

我正在尝试使第一个图像像第三个图像一样模糊，但是我做不到！ :(

I'm trying to blur first image like third one,But I cant do it ! :(

 header('Content-Type: image/jpeg');
$image = imagecreatefromjpeg('1.jpg');
for ($x=1; $x<=40; $x++){
    imagefilter($image, IMG_FILTER_GAUSSIAN_BLUR,999);
} 
    imagefilter($image, IMG_FILTER_SMOOTH,99);
    imagefilter($image, IMG_FILTER_BRIGHTNESS, 10);
imagejpeg($image);
imagedestroy($image);

推荐答案

尝试按比例缩小图像，并在调整大小后的图像上应用具有高斯模糊的循环.这样一来，您将可以在大图像上节省一些性能:

Try to scale down the image and apply the loop with gaussian blur on the resized image. That way you will save some performance on large images:

header('Content-Type: image/jpeg');
$file = '1.jpg';
$image = imagecreatefromjpeg($file);

    /* Get original image size */
    list($w, $h) = getimagesize($file);

    /* Create array with width and height of down sized images */
    $size = array('sm'=>array('w'=>intval($w/4), 'h'=>intval($h/4)),
                   'md'=>array('w'=>intval($w/2), 'h'=>intval($h/2))
                  );                       

    /* Scale by 25% and apply Gaussian blur */
    $sm = imagecreatetruecolor($size['sm']['w'],$size['sm']['h']);
    imagecopyresampled($sm, $image, 0, 0, 0, 0, $size['sm']['w'], $size['sm']['h'], $w, $h);

    for ($x=1; $x <=40; $x++){
        imagefilter($sm, IMG_FILTER_GAUSSIAN_BLUR, 999);
    } 

    imagefilter($sm, IMG_FILTER_SMOOTH,99);
    imagefilter($sm, IMG_FILTER_BRIGHTNESS, 10);        

    /* Scale result by 200% and blur again */
    $md = imagecreatetruecolor($size['md']['w'], $size['md']['h']);
    imagecopyresampled($md, $sm, 0, 0, 0, 0, $size['md']['w'], $size['md']['h'], $size['sm']['w'], $size['sm']['h']);
    imagedestroy($sm);

        for ($x=1; $x <=25; $x++){
            imagefilter($md, IMG_FILTER_GAUSSIAN_BLUR, 999);
        } 

    imagefilter($md, IMG_FILTER_SMOOTH,99);
    imagefilter($md, IMG_FILTER_BRIGHTNESS, 10);        

/* Scale result back to original size */
imagecopyresampled($image, $md, 0, 0, 0, 0, $w, $h, $size['md']['w'], $size['md']['h']);
imagedestroy($md);  

// Apply filters of upsized image if you wish, but probably not needed
//imagefilter($image, IMG_FILTER_GAUSSIAN_BLUR); 
//imagefilter($image, IMG_FILTER_SMOOTH,99);
//imagefilter($image, IMG_FILTER_BRIGHTNESS, 10);       

imagejpeg($image);
imagedestroy($image);

我借用了缩小规模的想法，并此回答的一些代码

I have borrowed the downsizing idea and some of the code form this answer

我已经用您的图像测试了解决方案，结果是:

I have tested the solution with your image, and the result:

您可以通过更改小图像的循环数来详细说明和增加/减少模糊.如果将for ($x=1; $x <=40; $x++){更改为for ($x=1; $x <=75; $x++){，您将获得更多的模糊感.

You can elaborate and increase/decrease the blur by changing the number of loops for the small image. If you change for ($x=1; $x <=40; $x++){ to for ($x=1; $x <=75; $x++){ you will get more blur.

该解决方案的缺点是由于调整大小，您将获得可见的像素化.与将模糊循环应用于原始大小的图像相比，它的优点是更好的性能，更少的服务器负载和执行时间.

The downside to this solution is that you will get som visible pixelation because of the resizing going on. The upside is better performance, less server load and execution time compared to if you would apply the blur loop on the original sized image.

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