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tjstankus/pdf_png_transparency.rb

Created June 21, 2010 11:59
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pdf_png_transparency.rb
require 'rubygems'
require 'prawn'
require 'prawn/measurement_extensions'
require 'prawn/fast_png'
require 'RMagick'
image = Magick::Image.new(300,300) do
self.background_color = 'black'
self.depth = 8 # without this it breaks in Windows
self.format = 'PNG'
end
shadow = image.shadow
shadow_blob = shadow.to_blob
pdf = Prawn::Document.new
pdf.image(StringIO.new(shadow_blob))
pdf.render_file('shadow.pdf')
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