Magro is a minimal image processing library in Ruby. Magro uses Numo::NArray arrays as image objects and provides basic image processing functions. Current supporting features are reading and writing JPEG and PNG images, image resizing with bilinear interpolation method, and image filtering.
Magro dependents libpng and libjpeg to provides functions reading and writing image file. Moreover, it is recommended that using libpng version 1.6 or later.
macOS:
$ brew install libpng libjpeg
Ubuntu (bionic):
$ sudo apt-get install libpng-dev libjpeg-dev
Add this line to your application's Gemfile:
gem 'magro'And then execute:
$ bundle
Or install it yourself as:
$ gem install magro
If you use homebrew on Apple M1 mac, specify the homebrew installation directory:
$ gem install magro -- --with-opt-dir=/opt/homebrew
> require 'magro'
=> true
> image = Magro::IO.imread('foo.png')
=> Numo::UInt8#shape=[512,512,3]
> grayscale = image.median(axis: 2)
=> Numo::UInt8#shape=[512,512]
> Magro::IO.imsave('foo_gray.png', grayscale)
=> trueBug reports and pull requests are welcome on GitHub at https://github.com/yoshoku/magro. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.
The gem is available as open source under the terms of the BSD-3-Clause License.