ImageMagick multiline text and background image

Question

I'm learning to use ImageMagick, but I'm having trouble when I try to generate an image like the example below:

And for that, I'm using the following code:

convert original.jpg -size 460x caption:'This is a multiline caption, This is a multiline caption, This is a multiline caption.' result.jpg

This command generated two separate images, one with just the title. Can you help me?

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PS: I'm using RubyOnRails with ImageMagick, but you can suggest examples with MiniMagick or Rmagick. Thanks.

Answer 1

This works in php and I can not see why it will not work o RubyOnRails:

convert original.jpg -size 460x -background transparent -fill black -pointsize 40 caption:'This is a multiline caption, This is a multiline caption, This is a multiline caption.'  -gravity center -composite result.jpg