How to use +repage option?

[NARKOZ]

From GraphicsMagick docs:

Use +repage to set the image page offsets to default.

http://www.graphicsmagick.org/GraphicsMagick.html#details-repage

Here is an example command:

convert logo.png \
  -resize 160x -resize 'x160<'  -resize 50% \
  -gravity center  -crop 80x80+0+0 +repage space_fill_2.jpg

In Ruby with mini_magick:

image.combine_options do |c|
  c.resize '160x'
  c.resize 'x160<'
  c.resize '50%'
  c.gravity 'center'
  c.crop "80x80+0+0"
  c.repage
end

This sends -repage and it throws error:

MiniMagick::Error: Command ("gm mogrify -resize 160x -resize x160< -resize 50% -gravity center -crop 80x80+0+0 -repage logo.png") failed: {:status_code=>1, :output=>"gm mogrify: Option '-repage' requires an argument or argument is malformed.\n"}
from --/bundler/gems/minimagick-34a9776b0002/lib/mini_magick.rb:420:in `run'

[NARKOZ]

c.repage.+

Not obvious and not documented.

[thiagofm]

@NARKOZ feel free to document it.