Class: WaxIiif::Utilities::PdfSplitter

Inherits:
Object
  • Object
show all
Defined in:
lib/wax_iiif/utilities/pdf_splitter.rb

Overview

Class PdfSplitter is a utility function designed to convert a PDF into a stack of images.

Author:

Class Method Summary collapse

Class Method Details

.split(path, options = {}) ⇒ Array<String>

Convert a PDF File into a series of JPEG images, one per-page

Parameters:

  • path (String) —

    The path to the PDF file

  • options (Hash) (defaults to: {}) —

    The configuration hash

Returns:

  • (Array<String>) —

    The paths to the generated files



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# File 'lib/wax_iiif/utilities/pdf_splitter.rb', line 16

def self.split(path, options = {})
  puts "processing #{path}" if options.fetch(:verbose, false)

  name        = File.basename(path, File.extname(path))
  output_dir  = "#{options.fetch(:output_dir, '.')}/#{name}"
  pages       = []
  pdf         = MiniMagick::Image.open(path)
  max_digits  = pdf.pages.length.digits.length

  pdf.pages.each_with_index do |page, index|
    FileUtils.mkdir_p output_dir
    page_file_name = "#{output_dir}/#{index.to_s.rjust(max_digits, '0')}.jpg"

    MiniMagick::Tool::Convert.new do |convert|
      convert.density('300')
      convert.units('PixelsPerInch')
      convert << page.path
      convert.quality('80')
      convert.colorspace('sRGB')
      convert.interlace('none')
      convert.flatten
      convert << page_file_name
    end
    pages.push(page_file_name)
  end
  GC.start

  pages
end