blocks|key|283915|text|尝试：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|283916|$image+=+new+Imagick('transparent.png');
$image->setImageMatte(true);
$image->setImageMatteColor('white');
$image->setImageAlphaChannel(Imagick::ALPHACHANNEL_OPAQUE);
$image->writeImage('opaque.jpg');|code-block|syntax|javascript|283917|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try:

<pre><code>$image = new Imagick('transparent.png');
$image-&gt;setImageMatte(true);
$image-&gt;setImageMatteColor('white');
$image-&gt;setImageAlphaChannel(Imagick::ALPHACHANNEL_OPAQUE);
$image-&gt;writeImage('opaque.jpg');
</code></pre>

blocks|key|3203923|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3203924|$white->newImage($image->getImageWidth(),+$image->getImageHeight(),+"transparent");|code-block|syntax|javascript|3203925|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this one:

<pre><code>$white-&gt;newImage($image-&gt;getImageWidth(), $image-&gt;getImageHeight(), "transparent");
</code></pre>

blocks|key|2990247|text|我在将PDF转换为PNG时遇到了同样的问题，我使用了flattenImages()。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2990248|++++++++//get+the+first+page+of+the+PDF
++++++++$im+=+new+imagick(+$file.'[0]'+);

++++++++//set+the+background+to+white
++++++++$im->setImageBackgroundColor('white');

++++++++//flatten+the+image
++++++++$im+=+$im->flattenImages();+

++++++++//do+the+rest+of+the+image+operations
++++++++$im->setResolution(+181,+181+);
++++++++$im->setCompressionQuality(100);
++++++++$im->resizeImage+(+181,+181,++imagick::FILTER_LANCZOS,+1,+TRUE);
++++++++$im->setImageFormat('png');
++++++++$imageName+=+$title.'_thumb.png';|code-block|syntax|javascript|2990249|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I ran into the same problem when converting PDFs to PNGs, and I used flattenImages().

<pre><code> //get the first page of the PDF
 $im = new imagick( $file.'[0]' );

 //set the background to white
 $im-&gt;setImageBackgroundColor('white');

 //flatten the image
 $im = $im-&gt;flattenImages(); 

 //do the rest of the image operations
 $im-&gt;setResolution( 181, 181 );
 $im-&gt;setCompressionQuality(100);
 $im-&gt;resizeImage ( 181, 181, imagick::FILTER_LANCZOS, 1, TRUE);
 $im-&gt;setImageFormat('png');
 $imageName = $title.'_thumb.png';
</code></pre>

blocks|key|280235|text|$image+=+new+Imagick('transparent.pdf');
$image->setImageType+(imagick::IMGTYPE_TRUECOLOR);
$image->writeImage('opaque.tif');|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|280236|都是为了我！|unstyled|280237|(而不是以前的imagick::IMGTYPE_TRUECOLORMATTE)|280238|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>$image = new Imagick('transparent.pdf');
$image-&gt;setImageType (imagick::IMGTYPE_TRUECOLOR);
$image-&gt;writeImage('opaque.tif');
</code></pre>

did for me!

(instead of the formerly imagick::IMGTYPE_TRUECOLORMATTE)

blocks|key|3203985|text|您可以通过更改Imagick常量进行尝试，如下所示|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3203986|//$image+will+conatains+image+which+needs+background+to+be+transparent
$white+=+new+Imagick();

$white->newImage($image->getImageWidth(),+$image->getImageHeight(),+new+ImagickPixel(+"white"+));
$white->compositeimage($image,+Imagick::COMPOSITE_DEFAULT,+$x1OfTransparentImage,+$y1OfTransparentImage,);
$white->flattenImages();
$white->writeImage('opaque.jpg');++++

$white->destroy();|code-block|syntax|javascript|3203987|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can try it by changing Imagick constant as shown below

<pre><code>//$image will conatains image which needs background to be transparent
$white = new Imagick();

$white-&gt;newImage($image-&gt;getImageWidth(), $image-&gt;getImageHeight(), new ImagickPixel( "white" ));
$white-&gt;compositeimage($image, Imagick::COMPOSITE_DEFAULT, $x1OfTransparentImage, $y1OfTransparentImage,);
$white-&gt;flattenImages();
$white-&gt;writeImage('opaque.jpg'); 

$white-&gt;destroy();
</code></pre>

blocks|key|3204048|text|flattenImages()实际上是有效的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3204049|但请记住，它不会修改给定的\Imagick()对象，而是返回一个新对象|3204050|$image+=+new+\Imagick('transparent.png');

//+Need+to+use+the+result+of+$image->flattenImages()+here!
$image+=+$image->flattenImages();
$image->writeImage('opaque.jpg');|code-block|syntax|javascript|3204051|flattenImages()默认为背景颜色white。如果你想使用另一种背景颜色，你必须在加载图像之前设置它：|3204052|$image+=+new+\Imagick();

//+Needs+to+be+called+before+the+image+is+loaded!
$image->setbackgroundcolor('green');
$image->readimage('transparent.png');

$image+=+$image->flattenImages();
$image->writeImage('opaque.jpg');|3204053|通常，Imagick+API对于函数调用的顺序非常敏感(就像命令行上的convert及其参数一样)，所以一定要检查您的顺序是否正确。|3204054|祝好运!|3204055|编辑2016年4月：|3204056|$image->flattenImages()+was+deprecated，应替换为：|3204057|$image->mergeImageLayers(\Imagick::LAYERMETHOD_FLATTEN)|3204058|很难找到关于这一点的确切信息，但这似乎适用于PHP5.6+>=。|3204059|感谢vee的提示！|3204060|entityMap|0|LINK|mutability|MUTABLE|url|http://www.imagemagick.org/api/deprecate.php#MagickFlattenImages^0|0|F|0|D|A|0|0|0|F|M|5|0|0|Z|7|0|0|0|0|N|O|E|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1F|8|@$9|1G|A|1H|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1I|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1J|8|@$9|1K|A|1L|B|C]|$9|1M|A|1N|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|1O|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1P|8|@$9|1Q|A|1R|B|C]]|D|@]|E|$]]|$1|S|3|T|5|6|7|1S|8|@]|D|@]|E|$]]|$1|U|3|V|5|6|7|1T|8|@]|D|@]|E|$]]|$1|W|3|X|5|6|7|1U|8|@$9|1V|A|1W|B|C]]|D|@$9|1X|A|1Y|1|1Z]]|E|$]]|$1|Y|3|Z|5|J|7|20|8|@]|D|@]|E|$K|L]]|$1|10|3|11|5|6|7|21|8|@]|D|@]|E|$]]|$1|12|3|13|5|6|7|22|8|@]|D|@]|E|$]]|$1|14|3|-4|5|6|7|23|8|@]|D|@]|E|$]]]|15|$16|$5|17|18|19|E|$1A|1B]]]]

<code>flattenImages()</code> actually works.

But keep in mind that it doesn't modify the given <code>\Imagick()</code> object but returns a new one:

<pre><code>$image = new \Imagick('transparent.png');

// Need to use the result of $image-&gt;flattenImages() here!
$image = $image-&gt;flattenImages();
$image-&gt;writeImage('opaque.jpg');
</code></pre>

<code>flattenImages()</code> defaults to the background color <code>white</code>. If you want to use another background color you have to set it before loading the image:

<pre><code>$image = new \Imagick();

// Needs to be called before the image is loaded!
$image-&gt;setbackgroundcolor('green');
$image-&gt;readimage('transparent.png');

$image = $image-&gt;flattenImages();
$image-&gt;writeImage('opaque.jpg');
</code></pre>

In general the Imagick API is very sensible when it comes to the order of function calls (just like <code>convert</code> and its parameters on the command line) so always check if your order is correct.

Good luck!

Edit April 2016:

<code>$image-&gt;flattenImages()</code> <a href="http://www.imagemagick.org/api/deprecate.php#MagickFlattenImages" rel="noreferrer">was deprecated</a> and should be replaced by:

<pre><code>$image-&gt;mergeImageLayers(\Imagick::LAYERMETHOD_FLATTEN)
</code></pre>

It's hard to find exact informations about this, but it seems that this applies to PHP >= 5.6.

Thanks to vee for the tip!

blocks|key|3204072|text|尝试以下方法，它对我很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3204073|$im+=+new+Imagick('trans.png');
$im->setimagebackgroundcolor('white');
$im+=+$im->flattenimages();

$im->writeimage('transToWhite.jpg');|code-block|syntax|javascript|3204074|希望这能有所帮助！|3204075|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Try the following, it works for me:

<pre><code>$im = new Imagick('trans.png');
$im-&gt;setimagebackgroundcolor('white');
$im = $im-&gt;flattenimages();

$im-&gt;writeimage('transToWhite.jpg');
</code></pre>

Hope that helps!

blocks|key|3204111|text|段错误问题：我有类似的问题(脚本一直给我段错误，即使图像被正确处理和写入)，我找到的解决方案是在检查错误报告后找到的，请参阅：https://bugs.php.net/bug.php?id=61122|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3204112|知道了这一点，试着添加|3204113|$white->setResourceLimit(6,+1);+//+6+means+"limit+threads+to"|CODE|3204114|在有问题的行之前(在我的例子中，我必须把它放在$im->resizeImage(...)；之前)|3204115|entityMap|0|LINK|mutability|MUTABLE|url|https://bugs.php.net/bug.php?id=61122^0|0|6|1R|11|0|0|0|0|1P|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|6|7|10|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|11|8|@$9|12|A|13|B|J]]|D|@]|E|$]]|$1|K|3|L|5|6|7|14|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Segfault issue:
I had a similar problem (script kept giving me segfault, even when the image was properly processed and written), the solution I found came after checking bug reports, see:
<a href="https://bugs.php.net/bug.php?id=61122" rel="nofollow">https://bugs.php.net/bug.php?id=61122</a>

Knowing that, try adding 
 <code>$white-&gt;setResourceLimit(6, 1); // 6 means "limit threads to"</code> 
before the problematic line (in my case I had to put it before $im->resizeImage(...);)

blocks|key|3204142|text|关于segfault的问题，我遇到了同样的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3204143|显然，$image->writeImage('somename')会破坏$image或对它的引用。|offset|length|style|CODE|3204144|我也遇到了同样的问题。我解决这个问题的方法是删除对我已经写完的对象进行销毁的调用。看似草率，但这解决了使用segfault的问题|3204145|entityMap^0|0|3|U|10|6|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]|$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|K|$]]

Regarding the issue with segfault I ran into the same issue. 
Apparently <code>$image-&gt;writeImage('somename')</code> destroys <code>$image</code> or the reference to it.

I was running into the same issue. The way I got around it was by removing the call to destroy on the object that I had finished writing. Seems sloppy but that solved the issue with the segfault

blocks|key|284061|text|我遇到过一种情况，我试图用白色替换透明背景(但保留为png)。尝试了几种不同的方法(包括使用setImageBackgroundColor的setImageAlphaChannel+)。结合OP对compositeImage的使用，我想到了这个(希望对其他人有帮助)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|284062|$pic+=+new+Imagick($filelocation);+//specify+file+name
$pic->setResourceLimit(6,+1);
if+($pic->getImageAlphaChannel())+{
++++$white+=+new+Imagick();
++++$white->newImage($pic->getImageWidth(),+$pic->getImageHeight(),+"white");
++++$white->compositeImage($pic,+Imagick::COMPOSITE_OVER,+0,+0);
++++$pic+=+clone+$white;
++++$white->destroy();
++++$pic->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);
}
//do+more+things+with+$pic|code-block|syntax|javascript|284063|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I had a situation where I was trying to replace transparent background with white (but keep as png). Tried several different methods (including setImageAlphaChannel with setImageBackgroundColor). Combining OP's use of compositeImage I came up with this (hopefully helpful to someone else):

<pre><code>$pic = new Imagick($filelocation); //specify file name
$pic-&gt;setResourceLimit(6, 1);
if ($pic-&gt;getImageAlphaChannel()) {
 $white = new Imagick();
 $white-&gt;newImage($pic-&gt;getImageWidth(), $pic-&gt;getImageHeight(), "white");
 $white-&gt;compositeImage($pic, Imagick::COMPOSITE_OVER, 0, 0);
 $pic = clone $white;
 $white-&gt;destroy();
 $pic-&gt;mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);
}
//do more things with $pic
</code></pre>

I have a png image with a transparent background and I want to convert it to a jpg image with a white background.

The code is basically this:

<pre><code>$image = new Imagick('transparent.png');
$image-&gt;writeImage('opaque.jpg');
</code></pre>

But that creates a black background jpg. I've been struggling with the worst documentation ever trying to find a way to convert the transparent to white to no avail.

Edit:
Well, I tried Marc B's idea and kind of got it to work.

<pre><code>$image = new Imagick('transparent.png');
$white = new Imagick();

$white-&gt;newImage($image-&gt;getImageWidth(), $image-&gt;getImageHeight(), "white");
$white-&gt;compositeimage($image, Imagick::COMPOSITE_OVER, 0, 0);
$white-&gt;writeImage('opaque.jpg');

$image-&gt;destroy();
$white-&gt;destroy();
</code></pre>

The problem now is, it always causes the script to segfault.

Transparent to white in Imagick for PHP

我有一个透明背景的png图像，我想把它转换成一个白色背景的jpg图像。代码基本上是这样的：$image = new Imagick('transparent.png');$image->writeImage('opaque.jpg');但这会创建一个黑色的背景jpg。我一直在与有史以来最糟糕的文档作斗争，试图找到一种将...

问Imagick for PHP中的透明到白色
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