Posted: 2006-10-02T21:25:51-07:00
You are drawing an opaque white arc. Instead you want to use a fill color that includes some degree of transparency.
Use https://github.com/ImageMagick/ImageMagick/discussions instead.
https://imagemagick.com/discourse-server/
https://imagemagick.com/discourse-server/viewtopic.php?t=7514