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I'm trying to add the --density flag to the libvips command so that PDFs (or other vector images) convert to JPG at an acceptable resolution.

Context—before I upgraded to a recent version of image_processing, I was using MiniMagick with the older version and was able to add arbitrary flags using this code:

  MiniMagick::Tool::Convert.new do |convert|
    convert << "-verbose" 
    convert << "-background" << "white"
    convert << "-flatten"
    convert << "-density" << "300"
    convert << page.path          
    convert << "-quality" << "82"
    convert << page_image.path
  end
Dauncing
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1 Answers1

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I think libvips equivalent of ImageMagick -density is the :dpi option on vips_pdfload(). With image_processing gem you can set it via loader:

require "image_processing/vips"

ImageProcessing::Vips
  .source(image)
  .loader(dpi: 300)
  .saver(quality: 82)
  # ...
Janko
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