ImageMagick / PHP调整大小问题：图像不会调整大小，但安装了ImageMagick

Question

I am having an odd issue with ImageMagick.

In the same script, I have the following code:

 $ct = system("convert -version");
 echo $ct;

And that displays the following response:

 Version: ImageMagick 6.6.0-4 2012-04-26 Q16 http://www.imagemagick.org Copyright: Copyright (C) 1999-2010 ImageMagick Studio LLC Features: OpenMP

However, when I attempt to do this:

 $ct2 = system("convert -resize 800x600 test-image.jpg test-image2.jpg", $retval);
 echo $retval;

It returns 1, but the image does not get resized. Shouldn't a second image be created, resized, under the file name "test-image2.jpg"? I checked the directory permissions, and they're set to 0777, so that shouldn't be the issue. Any idea what could be going on here?

Answer 1

A return code of 1 is usually considered an error. 0 means "no error occurred".

I think it is because you have your arguments in the wrong order. ImageMagick wants an input file, a bunch of operations and then an output file. Try to switch order on the arguments:

convert test-image.jpg -resize 800x600 test-image2.jpg

---

A good idea is to check out the IMagick extension for PHP. It gives you an object-oriented interface to most of the ImageMagick functions.

Answer 2

Try this to display the error:

$array = array(); 
echo "<pre>"; 
exec("convert test-image.jpg -resize 800x600 test-image2.jpg 2>&1", $array);  
echo "<br>".print_r($array)."<br>";  
echo "</pre>";  

Also I use exec not system, as said above the filename should come straight after convert and I would not use - but _ instead.

System outputs to the screen and exec does not so in your first code you should have been able to use this:

system("convert -version"); 

Try this and see what the path to IM is and try changing convert to the path which will probably be something like /usr/local/bin/convert

echo "<pre>";
system("type convert"); 
echo "</pre>";