/usr/share/doc/ruby-rmagick/examples/describe.rb is in ruby-rmagick 2.13.2-3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | # Purpose: Demonstrate getting information from the image attributes.
# Usage: describe.rb filename1 [filename2...]
# Notes: The output is similar to ImageMagick's identify command.
require 'RMagick'
puts <<END_INFO
This example shows how to extract attributes from an image.
END_INFO
if ARGV.length == 0
puts "Specify one or more image filenames as arguments."
exit
end
ARGV.each { |file|
puts file
img = Magick::Image::read(file).first
puts " Format: #{img.format}"
puts " Geometry: #{img.columns}x#{img.rows}"
puts " Class: " + case img.class_type
when Magick::DirectClass
"DirectClass"
when Magick::PseudoClass
"PseudoClass"
end
puts " Depth: #{img.depth} bits-per-pixel"
puts " Colors: #{img.number_colors}"
puts " Filesize: #{img.filesize}"
puts " Resolution: #{img.x_resolution.to_i}x#{img.y_resolution.to_i} "+
"pixels/#{img.units == Magick::PixelsPerInchResolution ?
"inch" : "centimeter"}"
if img.properties.length > 0
puts " Properties:"
img.properties { |name,value|
puts %Q| #{name} = "#{value}"|
}
end
}
|