You could just draw the rectange with a 50% transparent white.
Current that is specified as -fill '#FFFFFF80'
For an example see Annotation Images, Label Overlays...
http://www.cit.gu.edu.au/~anthony/graph ... /#label_on
Their is a request however to allow something like a white_50%
specification for colors, or at least something along those lines, but it
is still under discussion.
short cut to add ing transparent overly
- anthony
- Posts: 8883
- Joined: 2004-05-31T19:27:03-07:00
- Authentication code: 8675308
- Location: Brisbane, Australia
Anthony Thyssen -- Webmaster for ImageMagick Example Pages
https://imagemagick.org/Usage/
https://imagemagick.org/Usage/