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seki/p5.rb

Created December 9, 2021 11:14
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create 16bit PGM
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p5.rb
name = ARGV.shift || 'p5.pgm'
buf = "P5 256 256 65535\n" + (0...(256 ** 2)).to_a.pack('n*')
File.write(name, buf)
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