MagickWand for Crystal

Crystal C bindings for MagickWand library, an interface to use the ImageMagick image processing libraries - see www.imagemagick.org

NOTE: Base on ImageMagick-7.0.8-66. MagickWand is a quite large library, if you find something missing contact me

Requirements

• libMagickWand must be installed
• pkg-config must be available

Installation

• Add this to your application's shard.yml:

dependencies:
  magickwand-crystal:
    github: blocknotes/magickwand-crystal

Usage

Get image info:

require "magickwand-crystal"
LibMagick.magickWandGenesis    # lib init
wand = LibMagick.newMagickWand # lib init
if LibMagick.magickReadImage( wand, "test.png" )
  puts LibMagick.magickGetImageWidth wand
  puts LibMagick.magickGetImageHeight wand
end
LibMagick.destroyMagickWand wand  # lib deinit
LibMagick.magickWandTerminus      # lib deinit

Scale image and save in Jpeg format:

require "magickwand-crystal"
# ... lib init ...
LibMagick.magickReadImage wand, "test.png"
LibMagick.magickScaleImage wand, 320, 240
LibMagick.magickWriteImage wand, "test2.jpg"
# ... lib deinit ...

Convert to grayscale:

require "magickwand-crystal"
# ... lib init ...
LibMagick.magickReadImage wand, "test.jpg"
LibMagick.magickTransformImageColorspace wand, LibMagick::ColorspaceType::GRAYColorspace
LibMagick.magickWriteImage wand, "grayscale.jpg"
# ... lib deinit ...

More examples

See examples folder. There is also an example to generate an image on the fly with Kemal.

Documentation

The functions mapped have the same names of the MagickWand C library but with the first letter in lowercase.

Example: MagickWandGenesis => LibMagick.magickWandGenesis

• MagickWand C Documentation
• MagickWand Examples in C

Notes

Branches with different ImageMagick version:

• im_6.9.7-3
• im_7.0.4-1

The Crystal Magic Wand ! :)

Sounds funny but I hope you find it a useful piece of software.

Contributors

• Mattia Roccoberton - creator, maintainer, Crystal fan :)