Pontifications

• Here’s how to use the Imagemagick V7 -vignette option to make a circular crop of an image (via Stack Overflow::ImageMagick: How can I cut out round from image?):

magick input.png -vignette 0x0+0+0 output.png

• This assumes a square input image, but if it isn’t you use the -vignette geometry parameter.
• This is simpler than my previous post from August 15, HowTo: Circular Crop with ImageMagick

How To Install Imagemagick V7

• from https://linuxconfig.org/how-to-install-imagemagick-7-on-ubuntu-18-04-linux ; installed on Lenovo ARM64 C630

cd
wget https://www.imagemagick.org/download/ImageMagick.tar.gz
tar xf ImageMagick.tar.gz
cd ImageMagick-7.0.8-61/
./configure
make
sudo make install
sudo ldconfig /usr/local/lib
identify -version
magick -version

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