WARNING:

The stuff below is now 2+ years old, no clue if anything still works that way. I highly recommend you look at a Docker image instead that has the imagemagick dependencies (via apt install php-imagick or something along these lines).

How to get php_imagick up and running on Azure App Service with Windows web workers

DISCLAIMER:
If this totally and permanently bricks your site, don't blame me.

READ THIS FIRST:

At this point we strongly encourage looking at Web Apps for Containers for ImageMagick based workloads. If for one reason or another you can't use that, read on.

Extension and ImageMagick

Find suitable PHP extension and ImageMagick library dll's from

https://mlocati.github.io/articles/php-windows-imagick.html

UPDATE for PHP 7.4, VC15, x64, Non Thread Safe (NTS)

Tested working:

• PECL module: php_imagick-3.4.4-7.4-nts-vc15-x64.zip - http://windows.php.net/downloads/pecl/releases/imagick/3.4.4/php_imagick-3.4.4-7.4-nts-vc15-x64.zip

• ImageMagick Binaries: ImageMagick-7.0.7-11-vc15-x64.zip - http://windows.php.net/downloads/pecl/deps/ImageMagick-7.0.7-11-vc15-x64.zip

Follow the PHP 7.0 guide, just match the right binaries.

UPDATE for PHP 7.2, VC15, x64, Non Thread Safe (NTS)

Tested working:

• PECL module: php_imagick-3.4.3-7.2-nts-vc15-x64.zip - http://windows.php.net/downloads/pecl/snaps/imagick/3.4.3/

• ImageMagick Binaries: ImageMagick-7.0.7-11-vc15-x64.zip - http://windows.php.net/downloads/pecl/deps/

Follow the PHP 7.0 guide, just match the right binaries.

UPDATE for PHP 7.0, VC14, x86, Non Thread Safe (NTS)

• Get the latest stable php_imagick.dll from here - https://pecl.php.net/package/imagick (3.4.3-stable used in this guide).

• Copy all CORE_RL_* files to d:\home\site\ImageMagick\

• Copy php_imagick.dll to d:\home\site\ext\

• Copy applicationHost.xdt (it's in this repo under /site) to d:\home\site. That's the XML transform responsible for adding d:\home\site\ImageMagick to PATH. Edit if you're using your own custom paths.

• Add MAGICK_CODER_MODULE_PATH Application Setting:

     Name: MAGICK_CODER_MODULE_PATH
    Value: d:\home\site\ImageMagick

• Add MAGICK_HOME Application Setting:

     Name: MAGICK_HOME
    Value: d:\home\site\ImageMagick

• Add PHP_EXTENSIONS Application Setting (apparently PHP 7.0 ignores PHP_INI_SCAN_DIR for some reason):

     Name: PHP_EXTENSIONS
    Value: d:\home\site\ext\php_imagick.dll

This is what you should have now:

• Restart the Web App

• At this point phpinfo() should return a imagick module section. Get the ImageMagick version that php_imagick.dll was built against:

We take a dependency here on ImageMagick-6.9.3-7-Q16-x86-dll.exe. Download and extract (always get the one ending in -x86-dll.exe) - http://ftp.icm.edu.pl/packages/ImageMagick/binaries/ImageMagick-6.9.3-7-Q16-x86-dll.exe (i'm using extract loosely here because you actually have to INSTALL that InstallShield package on your machine to get to the DLLs. InstallShield has no in-place extract. Small price to pay though.)

• Copy the IM_MOD* and FILTER* DLLs from modules\ to d:\home\site\ImageMagick (don't copy the folder structure, just the DLLs, you should have a flat structure in d:\home\site\ImageMagick\ with just a bunch of DLLs).

• It should now work, test with this snippet:

<?php
  /* Create a new imagick object */
  $im = new Imagick();
  /* Create new image. This will be used as fill pattern */
  $im->newPseudoImage(200, 200, "plasma:fractal");
  /* Create imagickdraw object */
  $draw = new ImagickDraw();
  /* Start a new pattern called "gradient" */
  $draw->pushPattern('gradient', 0, 0, 200, 200);
  /* Composite the gradient on the pattern */
  $draw->composite(Imagick::COMPOSITE_OVER, 0, 0, 200, 200, $im);
  /* Close the pattern */
  $draw->popPattern();
  /* Use the pattern called "gradient" as the fill */
  $draw->setFillPatternURL('#gradient');
  /* Set font size */
  $draw->setFontSize(36);
  /* Annotate some text */
  $draw->annotation(20, 50, "What do you mean this works and we still have daylight left???!!?");
  /* Create a new canvas object and a white image */
  $canvas = new Imagick();
  $canvas->newImage(1200, 70, "black");
  /* Draw the ImagickDraw on to the canvas */
  $canvas->drawImage($draw);
  /* 1px black border around the image */
  $canvas->borderImage('black', 1, 1);
  /* Set the format to PNG */
  $canvas->setImageFormat('png');

  /* Output the image */
  header("Content-Type: image/png");
  echo $canvas;
?>

Result:

NOTE: phpinfo() should now report a bunch of formats being supported:

For PHP 5.6, VC11, x86, Non Thread Safe

Follow the PHP 7.0 guide, just match the right binaries.

Tested working:

• PECL module: php_imagick-3.3.0rc2-5.6-nts-vc11-x86.zip - http://windows.php.net/downloads/pecl/releases/imagick/3.3.0rc2/

• ImageMagick Binaries: ImageMagick-6.8.8-1-Q16-x86-dll.exe - http://ftp.icm.edu.pl/packages/ImageMagick/binaries/

TO DO:

• This really needs to be packaged up as a Site Extension. Anyone? Scratch that, Mangesh Sangapu did it. The Site Extension is available here: https://www.siteextensions.net/packages/PHP7_64BIT_IMAGICK_6937/
• A magic extension that handle dependencies in some neat way. Anyone?