Paint text on given image with RMagick

paint_text.rb

#!/usr/bin/env ruby
# encoding: utf-8

require 'RMagick'
include Magick

image = Image.read("image.png").first

text = Draw.new
text.annotate(image, 0, 0, 0, 60, "測試！Test!") {
  self.encoding = 'Unicode'
  self.font_family = 'LiHei Pro'
  self.gravity = SouthGravity
  self.pointsize = 24
  self.stroke = 'transparent'
  self.fill = '#AA0000'
}

image.display