How to install ImageMagick with Wampserver 3.0.0 64?

Downloaded and installed latest ImageMagick:
ImageMagick-7.0.2-0-Q16-x64-dll.exe

Downloaded php_imagick-3.4.3rc1-5.6-ts-vc11-x64 from http://windows.php.net/downloads/pecl/releases/imagick/3.4.3rc1/

Unpacked php_imagick.dll into [wampserver directory]\bin\php\php5.6.16\ext

Added extension=php_imagick.dll to
[wampserver directory]\bin\apache\apache2.4.17\bin\php.ini

Got "no decode delegate for this image format" error, but at least imagick showed up in phpinfo() where I could see that php_imagick.dll was compiled with ImageMagick 6.9.3-7 Q16 x64. There was no obvious way to know this beforehand.

Downloaded ImageMagick-6.9.3-7-Q16-x64-dll.exe from http://ftp.icm.edu.pl/packages/ImageMagick/binaries/ (ImageMagick has removed this package from their site).

Uninstalled ImageMagick-7.0.2-0-Q16-x64,
installed ImageMagick-6.9.3-7-Q16-x64 to c:\ImageMagick,
added c:\ImageMagick to PATH (in front, to avoid collision with windows convert.exe).

Verified everything ok with:

 $image = new Imagick();
 $image->readImage([path to my jpeg]);

 $wm = new Imagick();
 $wm->readImage([path to my watermark png]);

 $image->compositeImage($wm, imagick::COMPOSITE_OVER, 5, 5);

 header("Content-Type: image/jpeg");
 echo $image;