Extract images from font

extractImagesFromFont.rb

require 'ttfunk'

file = TTFunk::File.open(ARGV[0])
size = 200
output_dir = ARGV[2]
`mkdir #{output_dir}`
cmap = file.cmap

chars = {}
unicode_chars = []

cmap.tables.each do |subtable|
  next if !subtable.unicode?
  chars = chars.merge( subtable.code_map )
end

chars = chars.keys
puts "\n -- Found #{chars.length} characters in this font \n\n"

chars.each do |t|
    `magick convert -size #{size} -background 'transparent' -fill '#fff' -gravity Center -font #{ARGV[0]} label:\"#{t.chr('UTF-8')}\" ./#{output_dir}/#{t}.png`
end