require 'rubygems'
require 'rqrcode'
require 'qr_image'
# qr code parameters
text = 'this is a test'
size = 4
level = 'h'
# produce the qr code
qr = rqrcode::qrcode.new(text, :size => size, :level => level)
# create the image and double its size
img = qrimage.new(qr).sample(6)
# write image to disk
img.write('./qr.png') { quality = 100 }
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