Measure image size/dimensions using pure Ruby.
Formats: apng, avif, bmp, cur, emf, gif, heic, heif, ico, j2c, jp2, jpeg, jpx, mng, pam, pbm, pcx, pgm, png, ppm, psd, svg, swf, tiff, webp, xbm, xpm.
gem install image_sizeAdd to your Gemfile:
gem 'image_size', '~> 3.0'image_size = ImageSize.path('spec/images/jpeg/436x429.jpeg')
image_size.format #=> :jpeg
image_size.width #=> 436
image_size.height #=> 429
image_size.w #=> 436
image_size.h #=> 429
image_size.size #=> [436, 429]
image_size.size.to_s #=> "436x429"
"#{image_size.size}" #=> "436x429"
image_size.size.width #=> 436
image_size.size.height #=> 429
image_size.size.w #=> 436
image_size.size.h #=> 429
image_size.media_type #=> "image/jpeg"
image_size.media_types #=> ["image/jpeg"]Or using IO object:
image_size = File.open('spec/images/jpeg/436x429.jpeg', 'rb'){ |fh| ImageSize.new(fh) }Any object responding to read and eof?:
require 'image_size'
image_size = ImageSize.new(ARGF)Works with open-uri, see experimental HTTP server interface below:
require 'image_size'
require 'open-uri'
image_size = URI.parse('http://www.rubycgi.org/image/ruby_gtk_book_title.jpg').open('rb') do |fh|
ImageSize.new(fh)
end
image_size = open('http://www.rubycgi.org/image/ruby_gtk_book_title.jpg', 'rb') do |fh|
ImageSize.new(fh)
endNote that starting with version 2.0.0 the object given to ImageSize will not be rewound before or after use.
So rewind if needed before passing to ImageSize and/or rewind after passing to ImageSize before reading data.
require 'image_size'
File.open('spec/images/jpeg/436x429.jpeg', 'rb') do |fh|
image_size = ImageSize.new(fh)
fh.rewind
data = fh.read
end
File.open('spec/images/jpeg/436x429.jpeg', 'rb') do |fh|
data = fh.read
fh.rewind
image_size = ImageSize.new(fh)
endIf server recognises Range header, only needed chunks will be fetched even for TIFF images, otherwise required amount of data will be fetched, in most cases first few kilobytes (TIFF images is an exception).
require 'image_size/uri'
url = 'http://upload.wikimedia.org/wikipedia/commons/b/b4/Mardin_1350660_1350692_33_images.jpg'
p ImageSize.url(url).sizeThis interface is as fast as dedicated gem fastimage for images with meta information in the header:
url = 'http://upload.wikimedia.org/wikipedia/commons/b/b4/Mardin_1350660_1350692_33_images.jpg'
puts Benchmark.measure{ p FastImage.size(url) }[9545, 6623]
0.004176 0.001974 0.006150 ( 0.282889)
puts Benchmark.measure{ p ImageSize.url(url).size }[9545, 6623]
0.005604 0.001406 0.007010 ( 0.238629)
And considerably faster for images with meta information at the end of file:
url = "https://upload.wikimedia.org/wikipedia/commons/c/c7/Curiosity%27s_Vehicle_System_Test_Bed_%28VSTB%29_Rover_%28PIA15876%29.tif"
puts Benchmark.measure{ p FastImage.size(url) }[7360, 4912]
0.331284 0.247295 0.578579 ( 6.027051)
puts Benchmark.measure{ p ImageSize.url(url).size }[7360, 4912]
0.006247 0.001045 0.007292 ( 0.197631)
This code is free to use under the terms of the Ruby's licence.
Original author: Keisuke Minami [email protected].
Further development 2010-2024 Ivan Kuchin https://github.com/toy/image_size
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