ImageMagick with Php7.1 on Windows 10 with Apache 2.4

I’m trying to get Omeka S to recognize the ‘imagemagick_dir’ path in local.config.php for imagemagick
Here’s the set up
Php 7.1 on Apache 2.4 on Windows 10
Imagemagick works using php, can generate images fine using
new Imagick();

Also works fine on the command line with

magick logo: logo.gif
magick identify logo.gif
magick logo.gif win:

Yet I can’t get it to process a PDF, actually drawn from another Omeka S (doing some dev, this is the local instance for dev purposes). I have set the following as possible paths for the imagemagick in local.config.php, but they all return ImageMagick error: invalid ImageMagick command.

'imagemagick_dir' => 'C:\Program Files\ImageMagick-7.0.4-Q16',
'imagemagick_dir' => 'C:/Program Files/ImageMagick-7.0.4-Q16',
'imagemagick_dir' => 'C:\Program Files\ImageMagick-7.0.4-Q16/',
'imagemagick_dir' => '../../Program Files/ImageMagick-7.0.4-Q16/',

I have set MAGICK_HOME to C:/Program Files/ImageMagick-7.0.4-Q16 in my Environment Variables

In Omeka\File\Thumbnailer\ImageMagick.php I have tried the following permutations (in conjunction with the above) to see if the command is different for Windows:

const CONVERT_COMMAND = 'convert';
const CONVERT_COMMAND = 'convert.exe';
const CONVERT_COMMAND = 'magick.exe';
const CONVERT_COMMAND = 'magick';
const CONVERT_COMMAND = '\convert.exe';
const CONVERT_COMMAND = '\magick.exe';

Anyone have ideas? The upload of raw images works fine, so the folder permissions are fine. Php is handling imagemagick fine - just can’t get it to call from Omeka S.