Imagick: PNG support available in command line, but not available in PHP

问题

I found that I did not have PNG support in my Imagick installation, so I installed libpng. Now I can see that PNG format is supported when I run a command

convert -list format

And conversion from PNG to JPG works fine from command line:

convert a.png b.jpg

But when I try to read a PNG file in PHP:

    $src = new \Imagick();
    $src->readImageBlob( file_get_contents($file) ); // reading PNG format

-it gives me Error 500 ("...no decode delegate for this image format")

Also when I run phpinfo() - I see no PNG in list of Imagick's supported file formats. There are many others, but no PNG.

I tried to I resintall PHP Imagick driver and then restart apache - still no succeess.

PS: I have PHP 5.4 @ CentOS

回答1:

According to the installation requirements. "The amount of formats supported is by Imagick is entirely dependent upon the amount of formats supported by your ImageMagick installation." I imagine you’ll need to rebuild the PHP imagemagick extension. See here: http://php.net/manual/en/imagick.installation.php

回答2:

Problem solved.

I used a guide for Imagick installation @CentOS from the link below, reinstalled everything exactly as it said there, and it helped - http://www.directadmin.com/forum/showthread.php?t=44449&page=1

来源：https://stackoverflow.com/questions/13968345/imagick-png-support-available-in-command-line-but-not-available-in-php