ImageMagick: convert png fail via PHP and works via bash shell

Question

I've got a very weird bug which I've yet to find a solution. UPDATE see solution below

What I am trying to do is convert a full size picture into a 160x120 thumbnail. It works great with jpg and jpeg files of any size, but not with png.

ImageMagick command:

/opt/local/bin/convert '/WEBSERVER/images/img_0003-192-10.png' -thumbnail x320 -resize '320x<' -resize 50% -gravity center -crop 160x120+0+0 +repage -quality 91 '/WEBSERVER/thumbs/small_img_0003-192-10.png'

PHP function (shortened)

...
$cmd = "/opt/local/bin/convert '/WEBSERVER/images/img_0003-192-10.png' -thumbnail x320 -resize '320x<' -resize 50% -gravity center -crop 160x120+0+0 +repage -quality 91 '/WEBSERVER/thumbs/small_img_0003-192-10.png'";
exec($cmd, $output, $retval);
$errors += $retval;
if ($errors > 0) {
    die(print_r($output));
}

When this function runs $retval equal 1 which means the convert command failed (thumbnail isn't created).

This is where it gets interesting, if I run the exact same command in my shell, it works.

wedbook:~ wedix$ /opt/local/bin/convert '/WEBSERVER/images/img_0003-192-10.png' -thumbnail x320 -resize '320x<' -resize 50% -gravity center -crop 160x120+0+0 +repage -quality 91 '/WEBSERVER/thumbs/small_img_0003-192-10.png'
wedbook:~ wedix$ 

I've tried using different PHP function such as system, passthru but it didn't work. I thought maybe someone here knew the solution.

I'm using

1. MAMP 1.7.2
   • Apache/2.0.59
   • PHP/5.2.6

Thanks!

UPDATE

I updated the following dependencies

1. libpng from 1.2.35 to 1.2.37
2. libiconv from 1.12_2 to 1.13_0
3. ImageMagick 6.5.2-4_1 to 6.5.2-9_0

However, it did not fix my problem.

2nd UPDATE

I finally found something that might help, when the function runs this is what gets printed in the Apache logs:

dyld: Library not loaded: /opt/local/lib/libiconv.2.dylib
  Referenced from: /opt/local/bin/convert
  Reason: Incompatible library version: convert requires version 8.0.0 or later, but libiconv.2.dylib provides version 7.0.0

3rd UPDATE

libiconv.2.dylib is version 8.0.0...

bash-3.2$ otool -L /opt/local/lib/libiconv.2.dylib 
/opt/local/lib/libiconv.2.dylib:
    /opt/local/lib/libiconv.2.dylib (compatibility version 8.0.0, current version 8.0.0)
    /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.1.4)

4th UPDATE

Problem was related to MAMP, see solution below

Answer 1

Solved it!

It turns out the environement variable DYLD_LIBRARY_PATH wasn't set properly.

Mac OS X Leopard comes with libiconv 7.0.0 but convert requires 8.0.0 (see 2nd UPDATE above)

bash-3.2$ otool -L /usr/lib/libiconv.2.dylib 
/usr/lib/libiconv.2.dylib:
    /usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version 7.0.0)
    /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.1.1)

ImageMagick and all dependencies was installed with MacPorts under /opt/local. This requires to manually add the path /opt/local/lib to DYLD_LIBRARY_PATH.

If I add the path /opt/local/lib to DYLD_LIBRARY_PATH in the Mac OS X Leopard apachectl envvars file /usr/sbin/envvars it doesn't work. Why? It's because I don't use apache from Mac OS X Leopard, I use MAMP.

MAMP has its own apachectl script and it's own envvars file.

I added the path /opt/local/lib to DYLD_LIBRARY_PATH in the MAMP apachectl envvars file /Applications/MAMP/Library/bin/envvars

DYLD_LIBRARY_PATH="/opt/local/lib:/Applications/MAMP/Library/lib:$DYLD_LIBRARY_PATH"

Now my PNG thumbnails are being generated and no errors are generated in the apache error log!

I hope this will help someone and next time I'll remember to check every logs files before asking for help!

Phil

Answer 2

My path was /opt/local/bin, but even adding that to DYLD_LIBRARY_PATH didn't work. Finally when I changed just plain ole PATH, it worked via PHP.

;Did not work...

;DYLD_LIBRARY_PATH="/opt/local/bin:/Applications/MAMP/Library/lib:$DYLD_LIBRARY_PATH"

;export DYLD_LIBRARY_PATH

; This works!

export PATH="$PATH:/opt/local/bin"

Answer 3

Make sure the user running the php code has the same permissions on the files and directories.

Answer 4

These should be obvious, but make sure you check things like PHP safe mode, open_basedir, and whether exec has been disabled.