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k0kubun/transparent_png.rb

Last active December 19, 2015 07:18
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transparent_png.rb
require 'RMagick'
bmp_file_name = ARGV[0]
image = Magick::Image.read(bmp_file_name).first
top_left_pixel = image.pixel_color(0, 0)
top_left_color = top_left_pixel.to_color(Magick::AllCompliance, false, 8, true)
png_file_name = bmp_file_name.gsub(/bmp$/, 'png')
`convert -transparent "#{top_left_color}" #{bmp_file_name} #{png_file_name}`
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