If you’re hosting your WordPress site under IIS with PHP7 installed, you probably have the PHP ImageMagick extension that isn’t installed.
To do this, follow the guide…
Download the ImageMagick installer
Click on “Download” in the menu bar
Then “Windows Binary Releases” in the top links.
Select the “WinXX dynamic at 16-bit-per-pixel component,” make sure you select a dynamic, non-static component. Choose a 32- or 64-bit version depending on the Windows version.Read More