Replace "magic pink" with real transparency

textool.rb

require 'chunky_png'

#replaces magic-pink with actual transparency

img = ChunkyPNG::Image.from_file(ARGV.first)

img.height.times do |y|
  img.width.times do |x|
    img[x,y] = 0x00000000 if img[x,y] == 0xff00ffff
  end
end

img.save('trans_' + ARGV.first)