Thumbnails images using httpthumbniler server
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HTTP Thubnailer Client

Ruby client to httpthumbnailer image thumbnailing, editing and format conversion HTTP API server.



  • added edits support
  • better spec parsing and error handling
  • using single thumbnail API if only one thumbnail spec defined


gem install httpthumbnailer-client


Ruby API

require 'httpthumbnailer-client'

# read original image data (may be any format supported by ImageMagick/GraphicsMagick installation on the server)
data ='image_file.jpg')

# with API server listening on localhost port 3100
# see the API server documentation for available operations, formats and options

# generate single thumbnail from image data (single thumbnail API)
thumbnail ='http://localhost:3100').thumbnail(data, 'crop', 60, 30, 'jpeg')
thumbnail.mime_type   # => 'image/jpeg'
thumbnail.width       # => 60
thumbnail.height      # => 30        # => 60x30 thumbnail JPEG data String

# generate set of thumbnails from image data (multipart API)
thumbnails ='http://localhost:3100').thumbnail(data) do
  thumbnail 'crop', 60, 30, 'jpeg'
    thumbnail 'crop', 80, 80, 'png'
    thumbnail 'pad', 40, 40, 'png'

thumbnails[0].mime_type # => 'image/jpeg'
thumbnails[0].width     # => 60
thumbnails[0].height    # => 30
thumbnails[0].data      # => 60x30 thumbnail JPEG data String

thumbnails[1].mime_type # => 'image/png'
thumbnails[1].width     # => 80
thumbnails[1].height    # => 80
thumbnails[1].data      # => 80x80 thumbnail PNG data String

thumbnails[2].mime_type # => 'image/png'
thumbnails[2].width     # => 40
thumbnails[2].height    # => 40
thumbnails[2].data      # => 40x40 thumbnail PNG data String

thumbnails.input_mime_type  # => 'image/jpeg' - detected input image format by API server (content based)
thumbnails.input_width      # => 800 - detected input image width by API server (content based)
thumbnails.input_height     # => 600 - detected input image height by API server (content based)

# just identify the image
id ='http://localhost:3100').identify(data)
id.mime_type  # => 'image/jpeg'
id.width      # => 800
id.height     # => 600

# pass transaction ID header to thumbnailer
id ='http://localhost:3100').with_headers('XID' => '123').identify(data)
id.mime_type  # => 'image/jpeg'
id.width      # => 800
id.height     # => 600

# generate single thumbnail from image data with additional edits
thumbnail ='http://localhost:3100').thumbnail(data, 'crop', 60, 30, 'jpeg') do
    edit 'rotate', 90
    edit 'pixelate', 0.3, 0.2, 0.4, 0.4

# generate set of thumbnails from image data with additional edits
thumbnails ='http://localhost:3100').thumbnail(data) do
    thumbnail 'crop', 60, 30, 'jpeg' do
        edit 'rotate', 90
    thumbnail 'crop', 80, 80, 'png' do
        edit 'rotate', 270
        edit 'pixelate', 0.3, 0.2, 0.4, 0.4
    thumbnail 'pad', 40, 40, 'png'

For more details see RSpec for single thumbnail API and multipart API. Note that when providing only one thumbnail specification using multipart API style the client will actually use single thumbnail API instead.

CLI tool

This gem provides httpthumbnailer-client command line tool that can be used to thumbnail images via httpthumbnailer.

# start thumbnailing server (to stop: kill `cat`)

# identify image
cat image.jpg | httpthumbnailer-client

# thumbnail to standard output
cat image.jpg | httpthumbnailer-client -t crop,100,200,png > thumbnail.png

# generate multiple thumbnails
cat image.jpg | httpthumbnailer-client -t crop,100,200,jpeg,quality:100 -t pad,200,200,png thumbnail1.jpg thumbnail2.png

# generate thumbnail with edits
cat image.jpg | httpthumbnailer-client -t 'fit,280,280,png!pixelate,0.3,0.2,0.4,0.4!rectangle,0.04,0.8,0.92,0.17,color:blue' > thumbnail.png

Contributing to HTTP Thubnailer Client

  • Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet
  • Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it
  • Fork the project
  • Start a feature/bugfix branch
  • Commit and push until you are happy with your contribution
  • Make sure to add tests for it. This is important so I don't break it in a future version unintentionally.
  • Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.


Copyright (c) 2013 - 2015 Jakub Pastuszek. See LICENSE.txt for further details.