doujindou4356
2016-05-23 08:56
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PHP - 使用Imagick将所有图像转换为jpg - 质量差

I found more topics from this web site about quality with Imagick but nothing help me... I have to save all images as JPG. I created this script:

$image_url = 'http://limuzynamercedes.pl/wp-content/uploads/2014/06/3.png';
$image_code = file_get_contents($image_url);

$img = new Imagick();
$img -> readImageBlob($image_code);
$img->setResolution(300, 300);
$d = $img->getImageGeometry(); 
$img->cropImage($d['width'],($d['height']-120), 0,0);
$img->setImageFormat('jpeg');
$img->setImageCompression(imagick::COMPRESSION_JPEG); 
$img->setCompressionQuality(100); 
$img->writeImage('read.jpg');
$img->clear();

echo '<img src="read.jpg?'.time().'">';exit;

Here is original image: http://limuzynamercedes.pl/wp-content/uploads/2014/06/3.png and here is image which was converted by my script: http://s5.ifotos.pl/img/demo1jpg_saeaxqx.jpg

Where is a problem? Why this image is always convert in bad quality?

Thanks.

图片转代码服务由CSDN问答提供 功能建议

我从这个网站上找到了更多关于Imagick质量的主题，但没有什么能帮到我...... 我必须保存 所有图像均为JPG。 我创建了这个脚本： 

  $ image_url ='http://limuzynamercedes.pl/wp-content/uploads/2014/06/3.png';
$image_code  = file_get_contents（$ image_url）; 
 
 $ img = new Imagick（）; 
 $ img  - ＆gt;  readImageBlob（$ image_code）; 
 $ img-＆gt; setResolution（300,300）; 
 $ d = $ img-＆gt; getImageGeometry（）;  
 $ img-＆gt; cropImage（$ d ['width']，（$ d ['height']  -  120），0,0）; 
 $ img-＆gt; setImageFormat（'jpeg'）; 
  $ img-＆GT; setImageCompression（imagick :: COMPRESSION_JPEG）;  
 $的img-＆GT; setCompressionQuality（100）;  
 $ img-＆gt; writeImage（'read.jpg'）; 
 $ img-＆gt; clear（）; 
 
echo'＆lt; img src =“read.jpg？'。time（）。'”  ＆gt;';退出; 
   
 
 
这是原始图片： http://limuzynamercedes.pl/wp-content/uploads/2014/06/3.png  
这里是由我的脚本转换的图像： http://s5.ifotos.pl/img/demo1jpg_saeaxqx.jpg   
  
 
问题出在哪里？ 为什么这个图像总是转换质量差？ 
 
 
谢谢。
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1条回答 默认 最新

  • dsfsdfsd34324 2016-05-23 09:03
    已采纳

    The image is not in "bad quality" (there is no blurry areas found), but the difference between 2 images is caused by transparent PNG to JPG conversion.

    Before you crop the image, add these two lines:

    // set background to white (Imagick doesn't know how to deal with transparent background if you don't instruct it)
$img->setImageBackgroundColor(new ImagickPixel('white'));

// flattens multiple layers
$img = $img->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);
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