use label, it creates an image to fit the point size and text
see http://www.imagemagick.org/Usage/text/#label
automatic size using "caption"
- anthony
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Re: automatic size using "caption"
If you specify a size without a point size, BOTH label: and caption: will try to adjust the text size to best fit the space specified.
Anthony Thyssen -- Webmaster for ImageMagick Example Pages
https://imagemagick.org/Usage/
https://imagemagick.org/Usage/