gistfile1.rb

#!/usr/bin/ruby

require "rubygems"
require "RMagick"
require "kconv"
require "uri"

$KCODE = "utf8"

name = ARGV[0].toutf8
name =~ /^(\w)/
char = $1

filename = URI.escape(name)
image_path = "images/#{filename}.png"

image = Magick::ImageList.new.new_image(250, 250)
Magick::Draw.new.annotate(image, 0, 0, 0, 0, char) do
  self.font = "/usr/share/fonts/truetype/mikachan/mikachan.ttf"
  self.gravity = Magick::CenterGravity
  self.pointsize = 200
end
image.write(image_path)

circle = Magick::Draw.new
circle.stroke("black")
circle.stroke_width(10)
circle.fill_opacity(0)
circle.circle(125, 125, 25, 125)
circle.draw(image)

extent = image.change_geometry("250x300"){|cols,rows,img|
  img.resize_to_fit!(cols, rows)
  img.border(0, 25, 'white').roll(0, -25)
}
Magick::Draw.new.annotate(extent, 0, 0, 0, 0, name) do
  self.font = "/usr/share/fonts/truetype/mikachan/mikachan.ttf"
  self.gravity = Magick::SouthGravity
  self.pointsize = 50
end
extent.write("images/card_#{filename}.png")