/usr/share/doc/ruby-rmagick/examples/identify.rb is in ruby-rmagick-doc 2.16.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | require 'rmagick'
module Magick
class Image
# Print information similar to the identify -verbose command
def identify
printf 'Image: '
puts "#{base_filename}=>" if base_filename != filename
puts filename + "\n"
puts "\tFormat: #{format}\n"
puts "\tGeometry: #{columns}x#{rows}\n"
puts "\tClass: #{class_type}\n"
puts "\tType: #{image_type}\n"
puts "\tEndianess: #{endian}\n"
puts "\tColorspace: #{colorspace}\n"
puts "\tChannelDepth:\n"
color_space = gray? ? Magick::GrayColorspace : colorspace
case color_space
when Magick::RGBColorspace
puts "\t\tRed: #{channel_depth(Magick::RedChannel)}-bits\n"
puts "\t\tGreen: #{channel_depth(Magick::GreenChannel)}-bits\n"
puts "\t\tBlue: #{channel_depth(Magick::BlueChannel)}-bits\n"
puts "\t\tOpacity: #{channel_depth(Magick::OpacityChannel)}-bits\n" if matte
when Magick::CMYKColorspace
puts "\t\tCyan : #{channel_depth(Magick::CyanChannel)}-bits\n"
puts "\t\tMagenta: #{channel_depth(Magick::MagentaChannel)}-bits\n"
puts "\t\tYellow: #{channel_depth(Magick::YellowChannel)}-bits\n"
puts "\t\tBlack: #{channel_depth(Magick::BlackChannel)}-bits\n"
puts "\t\tOpacity: #{channel_depth(Magick::OpacityChannel)}-bits\n" if matte
when Magick::GrayColorspace
puts "\t\tGray: #{channel_depth(Magick::GrayChannel)}-bits\n"
puts "\t\tOpacity: #{channel_depth(Magick::OpacityChannel)}-bits\n" if matte
end
scale = Magick::QuantumRange / (Magick::QuantumRange >> (Magick::MAGICKCORE_QUANTUM_DEPTH-channel_depth))
puts "\tChannel statistics:\n"
case color_space
when Magick::RGBColorspace
puts "\t\tRed:\n"
puts "\t\t\tMin: " + sprintf("%u (%g)\n", channel_extrema(Magick::RedChannel)[0]/scale, channel_extrema(Magick::RedChannel)[0]/Magick::QuantumRange)
puts "\t\t\tMax: " + sprintf("%u (%g)\n", channel_extrema(Magick::RedChannel)[1]/scale, channel_extrema(Magick::RedChannel)[1]/Magick::QuantumRange)
puts "\t\t\tMean: " + sprintf("%g (%g)\n", channel_mean(Magick::RedChannel)[0]/scale, channel_mean(Magick::RedChannel)[0]/Magick::QuantumRange)
puts "\t\t\tStandard deviation: " + sprintf("%g (%g)\n", channel_mean(Magick::RedChannel)[1]/scale, channel_mean(Magick::RedChannel)[1]/Magick::QuantumRange)
puts "\t\tGreen:\n"
puts "\t\t\tMin: " + sprintf("%u (%g)\n", channel_extrema(Magick::GreenChannel)[0]/scale, channel_extrema(Magick::GreenChannel)[0]/Magick::QuantumRange)
puts "\t\t\tMax: " + sprintf("%u (%g)\n", channel_extrema(Magick::GreenChannel)[1]/scale, channel_extrema(Magick::GreenChannel)[1]/Magick::QuantumRange)
puts "\t\t\tMean: " + sprintf("%g (%g)\n", channel_mean(Magick::GreenChannel)[0]/scale, channel_mean(Magick::GreenChannel)[0]/Magick::QuantumRange)
puts "\t\t\tStandard deviation: " + sprintf("%g (%g)\n", channel_mean(Magick::GreenChannel)[1]/scale, channel_mean(Magick::GreenChannel)[1]/Magick::QuantumRange)
puts "\t\tBlue:\n"
puts "\t\t\tMin: " + sprintf("%u (%g)\n", channel_extrema(Magick::BlueChannel)[0]/scale, channel_extrema(Magick::BlueChannel)[0]/Magick::QuantumRange)
puts "\t\t\tMax: " + sprintf("%u (%g)\n", channel_extrema(Magick::BlueChannel)[1]/scale, channel_extrema(Magick::BlueChannel)[1]/Magick::QuantumRange)
puts "\t\t\tMean: " + sprintf("%g (%g)\n", channel_mean(Magick::BlueChannel)[0]/scale, channel_mean(Magick::BlueChannel)[0]/Magick::QuantumRange)
puts "\t\t\tStandard deviation: " + sprintf("%g (%g)\n", channel_mean(Magick::BlueChannel)[1]/scale, channel_mean(Magick::BlueChannel)[1]/Magick::QuantumRange)
when Magick::CMYKColorspace
puts "\t\tCyan:\n"
puts "\t\t\tMin: " + sprintf("%u (%g)\n", channel_extrema(Magick::CyanChannel)[0]/scale, channel_extrema(Magick::CyanChannel)[0]/Magick::QuantumRange)
puts "\t\t\tMax: " + sprintf("%u (%g)\n", channel_extrema(Magick::CyanChannel)[1]/scale, channel_extrema(Magick::CyanChannel)[1]/Magick::QuantumRange)
puts "\t\t\tMean: " + sprintf("%g (%g)\n", channel_mean(Magick::CyanChannel)[0]/scale, channel_mean(Magick::CyanChannel)[0]/Magick::QuantumRange)
puts "\t\t\tStandard deviation: " + sprintf("%g (%g)\n", channel_mean(Magick::CyanChannel)[1]/scale, channel_mean(Magick::CyanChannel)[1]/Magick::QuantumRange)
puts "\t\tMagenta:\n"
puts "\t\t\tMin: " + sprintf("%u (%g)\n", channel_extrema(Magick::MagentaChannel)[0]/scale, channel_extrema(Magick::MagentaChannel)[0]/Magick::QuantumRange)
puts "\t\t\tMax: " + sprintf("%u (%g)\n", channel_extrema(Magick::MagentaChannel)[1]/scale, channel_extrema(Magick::MagentaChannel)[1]/Magick::QuantumRange)
puts "\t\t\tMean: " + sprintf("%g (%g)\n", channel_mean(Magick::MagentaChannel)[0]/scale, channel_mean(Magick::MagentaChannel)[0]/Magick::QuantumRange)
puts "\t\t\tStandard deviation: " + sprintf("%g (%g)\n", channel_mean(Magick::MagentaChannel)[1]/scale, channel_mean(Magick::MagentaChannel)[1]/Magick::QuantumRange)
puts "\t\tYellow:\n"
puts "\t\t\tMin: " + sprintf("%u (%g)\n", channel_extrema(Magick::YellowChannel)[0]/scale, channel_extrema(Magick::YellowChannel)[0]/Magick::QuantumRange)
puts "\t\t\tMax: " + sprintf("%u (%g)\n", channel_extrema(Magick::YellowChannel)[1]/scale, channel_extrema(Magick::YellowChannel)[1]/Magick::QuantumRange)
puts "\t\t\tMean: " + sprintf("%g (%g)\n", channel_mean(Magick::YellowChannel)[0]/scale, channel_mean(Magick::YellowChannel)[0]/Magick::QuantumRange)
puts "\t\t\tStandard deviation: " + sprintf("%g (%g)\n", channel_mean(Magick::YellowChannel)[1]/scale, channel_mean(Magick::YellowChannel)[1]/Magick::QuantumRange)
puts "\t\tBlack:\n"
puts "\t\t\tMin: " + sprintf("%u (%g)\n", channel_extrema(Magick::BlackChannel)[0]/scale, channel_extrema(Magick::BlackChannel)[0]/Magick::QuantumRange)
puts "\t\t\tMax: " + sprintf("%u (%g)\n", channel_extrema(Magick::BlackChannel)[1]/scale, channel_extrema(Magick::BlackChannel)[1]/Magick::QuantumRange)
puts "\t\t\tMean: " + sprintf("%g (%g)\n", channel_mean(Magick::BlackChannel)[0]/scale, channel_mean(Magick::BlackChannel)[0]/Magick::QuantumRange)
puts "\t\t\tStandard deviation: " + sprintf("%g (%g)\n", channel_mean(Magick::BlackChannel)[1]/scale, channel_mean(Magick::BlackChannel)[1]/Magick::QuantumRange)
when Magick::GrayColorspace
puts "\t\tGray:\n"
puts "\t\t\tMin: " + sprintf("%u (%g)\n", channel_extrema(Magick::GrayChannel)[0]/scale, channel_extrema(Magick::GrayChannel)[0]/Magick::QuantumRange)
puts "\t\t\tMax: " + sprintf("%u (%g)\n", channel_extrema(Magick::GrayChannel)[1]/scale, channel_extrema(Magick::GrayChannel)[1]/Magick::QuantumRange)
puts "\t\t\tMean: " + sprintf("%g (%g)\n", channel_mean(Magick::GrayChannel)[0]/scale, channel_mean(Magick::GrayChannel)[0]/Magick::QuantumRange)
puts "\t\t\tStandard deviation: " + sprintf("%g (%g)\n", channel_mean(Magick::GrayChannel)[1]/scale, channel_mean(Magick::GrayChannel)[1]/Magick::QuantumRange)
end
if matte
puts "\t\tOpacity:\n"
puts "\t\t\tMin: " + sprintf("%u (%g)\n", channel_extrema(Magick::OpacityChannel)[0]/scale, channel_extrema(Magick::OpacityChannel)[0]/Magick::QuantumRange)
puts "\t\t\tMax: " + sprintf("%u (%g)\n", channel_extrema(Magick::OpacityChannel)[1]/scale, channel_extrema(Magick::OpacityChannel)[1]/Magick::QuantumRange)
puts "\t\t\tMean:" + sprintf("%u (%g)\n", channel_mean(Magick::OpacityChannel)[0]/scale, channel_mean(Magick::OpacityChannel)[0]/Magick::QuantumRange)
puts "\t\t\tStandard deviation:" + sprintf("%u (%g)\n", channel_mean(Magick::OpacityChannel)[1]/scale, channel_mean(Magick::OpacityChannel)[1]/Magick::QuantumRange)
end
if class_type == Magick::DirectClass
puts "\tColors: #{total_colors}\n"
else
if total_colors <= colors
puts "\tColors: #{colors}\n"
else
puts "\tColors: #{total_colors}=>#{colors}\n"
end
end
# Histogram goes here
puts "\tMean error per pixel: #{mean_error_per_pixel}\n" if mean_error_per_pixel != 0.0
puts "\tNormalized mean error: #{normalized_mean_error}\n" if normalized_mean_error != 0.0
puts "\tNormalized maximum error: #{normalized_maximum_error}\n" if normalized_maximum_error != 0.0
puts "\tRendering-intent: #{rendering_intent}\n"
puts "\tGamma: #{gamma}\n" if gamma != 0.0
chrom = chromaticity
if chrom.red_primary.x != 0.0 || chrom.green_primary.x != 0.0 || chrom.blue_primary.x != 0.0 || chrom.white_point.x != 0.0
puts "\tChromaticity:\n"
puts "\t\tred primary: (#{sprintf('%g,%g', chrom.red_primary.x, chrom.red_primary.y)})\n"
puts "\t\tgreen primary: (#{sprintf('%g,%g', chrom.green_primary.x, chrom.green_primary.y)})\n"
puts "\t\tblue primary: (#{sprintf('%g,%g', chrom.blue_primary.x, chrom.blue_primary.y)})\n"
puts "\t\twhite point: (#{sprintf('%g,%g', chrom.white_point.x, chrom.white_point.y)})\n"
end
ex_info = extract_info
if ex_info.width * ex_info.height != 0.0
puts "\tTile geometry: #{ex_info.width}x#{ex_info.height}+#{ex_info.x}+#{ex_info.y}\n"
end
if x_resolution != 0.0 && y_resolution != 0.0
puts "\tResolution: #{sprintf('%gx%g', x_resolution, y_resolution)}\n"
end
puts "\tUnits: #{units}\n"
size = filesize
if size >= 1048576
puts "\tFilesize: #{'%.1f' % (size/1048576.0)}mb\n"
elsif size >= 1024
puts "\tFilesize: #{'%.0f' % (size/1024.0)}kb\n"
else
puts "\tFilesize: #{size}b\n"
end
puts "\tInterlace: #{interlace}\n"
puts "\tBackground Color: #{background_color}\n"
puts "\tBorder Color: #{border_color}\n"
puts "\tMatte Color: #{matte_color}\n"
pg = page
if pg.width != 0 || pg.height != 0 || pg.x != 0 || pg.y != 0
puts "\tPage geometry: #{pg.width}x#{pg.height}+#{pg.x}+#{pg.y}\n"
end
puts "\tDispose: #{dispose}\n"
puts "\tDelay: #{delay}\n" if delay != 0
puts "\tIterations: #{iterations}\n" unless iterations == 1
puts "\tScene: #{scene}\n" if scene != 0
puts "\tCompression: #{compression}\n"
puts "\tQuality: #{quality}\n" unless quality == 0
puts "\tOrientation: #{orientation}\n"
puts "\tMontage: #{montage}\n" if montage
signature # compute but ignore - will be displayed along with the other properties
properties.each do |prop, value|
next if prop[0,1] == '['
puts "\t#{prop}: #{value}\n"
end
clip_path = self['8BIM:1999,2998:#1']
if clip_path
puts "\tClipping path: #{clip_path}\n"
end
each_profile do |name, value|
puts "\tProfile-#{name}: #{value.length}\n"
if name == 'exif'
exif_attrs = get_exif_by_entry
exif_attrs.each do |attr|
puts "\t\t#{attr[0]}: #{attr[1]}\n"
end
end
end
puts "\tTainted: True\n" if changed?
puts "\tTainted: False\n" unless changed?
puts "\tVersion: #{Magick::Version}\n"
puts "\t #{Magick::Magick_version}\n"
end
end
end
if ARGV.length == 0
puts <<-'END_USAGE'
This example displays information about the specified image file(s)
that is similar to ImageMagick/GraphicsMagick's identify command.
Usage:
ruby identify.rb filename [filename...]
END_USAGE
exit
end
ilist = Magick::ImageList.new(*ARGV)
ilist.each do |img|
img.identify
end
exit
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