Class: Lomo

Inherits:
Object
  • Object
show all
Defined in:
lib/lomo.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file) ⇒ Lomo

Returns a new instance of Lomo.



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# File 'lib/lomo.rb', line 6

def initialize(file)
  @file = File.expand_path(file)
  @dest = @file.sub /\.jpg$/i, "-lomo.png"
  @mask = File.join(File.dirname(__FILE__), "../img/mask.png")

  unless File.exists?(@file)
    usage
    exit
  end

  unless `convert --version`.match /ImageMagick/
    requirements
    exit
  end
end

Instance Attribute Details

#dest ⇒ Object (readonly)

Returns the value of attribute dest.



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# File 'lib/lomo.rb', line 3

def dest
  @dest
end

#file ⇒ Object (readonly)

Returns the value of attribute file.



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# File 'lib/lomo.rb', line 2

def file
  @file
end

#mask ⇒ Object (readonly)

Returns the value of attribute mask.



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# File 'lib/lomo.rb', line 4

def mask
  @mask
end

Instance Method Details

#process ⇒ Object 



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# File 'lib/lomo.rb', line 42

def process
  `cp #{file} #{dest}`
  `convert -resize 1024x768 #{dest} #{dest}`
  `cp #{dest} #{dest}-resized`
  `convert -unsharp 1 #{dest} #{dest}`
  `convert -contrast -contrast #{dest} #{dest}`
  `convert -modulate 100,150 #{dest} #{dest}`
  `composite -compose overlay #{mask} #{dest} #{dest}`
  `composite -compose multiply #{dest}-resized #{dest} #{dest}`
  `rm #{dest}-resized`
  `open #{dest}` if RUBY_PLATFORM.match /darwin/
end

#requirements ⇒ Object 



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# File 'lib/lomo.rb', line 33

def requirements
  puts <<-eos
    Requirements:

    This filter makes use of ImageMagick. It runs convert and composite with
    different parameters, so it won't work unless those commands are available.
  eos
end

#usage ⇒ Object 



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# File 'lib/lomo.rb', line 22

def usage
  puts <<-eos
    Usage:
      lomo path_to_image.jpg

    It will generate a 1024x768 version of the image with
    the lomo filter applied. ImageMagick is required for this
    to work.
  eos
end