Wand Lightning Talk

Introduction to Wand, a ctypes-based simple ImageMagick binding for Python. You can find the original of the presentation in this link: http://j.mp/pykr2012-wand

Transcript

1. Hong Minhee
   Wand
   

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3. Speaker: Hong Minhee
   http://dahlia.kr/
   https://github.com/dahlia
   https://bitbucket.org/dahlia
   @hongminhee
   

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4. Speaker: Hong Minhee
   Hobbyist programmer since 1999
   Python programmer since 2005
   PyPy enthusiast
   Anti-fan of Django
   StyleShare (2011–2012)
   

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5. https://stylesha.re/
   

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6. Speaker: Hong Minhee
   Hobbyist programmer since 1999
   Python programmer since 2005
   PyPy enthusiast
   Anti-fan of Django
   StyleShare (2011–2012)
   Crosspop (2012–)
   

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7. http://crosspop.in/
   

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8. Wand: Short introduction
   Image Processing Library
   Built on top of ImageMagick
   Modern PythonicTM API
   Supports CPython 2.6+, PyPy☆, Jython (soon)
   Well Documented
   Properly Packaged
   MIT Licensed
   Competitior of Python Imaging Library (PIL)
   

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9. Too many ImageMagick bindings
   PyPI Docs PyPy Update
   PythonMagick ☹ ☹ ☹ 2012-10
   PythonMagickWand
   Achim Domma
   ☺ ☹ ☹ 2008-07
   PythonMagickWand
   Ian Stevens
   ☹ ☹ ☹ 2009-01
   python-magickwand
   Benjamin Schweizer
   ☺ ☹ ☹ 2012-01
   magickwand
   Oliver Berger
   ☺ ☹ ☹ 2010-06
   Wand ☺ ☺ ☺ 2012-11
   

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10. Install
    $ pip install Wand
    $ easy_install Wand
    

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11. ImageMagick
    $ apt-get install libmagickwand-dev
    $ yum install ImageMagick-devel
    http://dahlia.kr/wand/guide/install.html
    

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12. try+finally < with
    from wand.image import Image
    try:
    image = Image(width=480, height=320)
    assert image.size == (480, 320)
    image.save(filename='transparent-480x320.jpg')
    finally:
    image.close()
    

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13. try+finally < with
    from wand.image import Image
    with Image(width=480, height=320) as image:
    assert image.size == (480, 320)
    image.save(filename='transparent-480x320.jpg')
    

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14. try+finally < with
    from wand.color import Color
    from wand.image import Image
    with Color('white') as bg:
    with Image(width=480, height=320, background=bg) as i:
    assert i.size == (480, 320)
    i.save(filename='white-480x320.jpg')
    

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15. Converting
    from urllib2 import urlopen
    from wand.image import Image
    with Image(file=urlopen('http://j.mp/wand-iu-1')) as i:
    assert i.format == 'jpeg'
    with i.convert('png') as png:
    png.save(filename='wand-iu-1.png')
    

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16. Resizing
    

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17. Resizing
    from urllib2 import urlopen
    from wand.image import Image
    with Image(file=urlopen('http://j.mp/wand-iu-1')) as i:
    i.save(filename='wand-iu-1.jpg')
    assert i.size == (1200, 800)
    i.resize(480, 320)
    i.save(filename='resized.jpg')
    

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18. Resizing
    

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19. Cropping
    

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20. Cropping
    from urllib2 import urlopen
    from wand.image import Image
    with Image(file=urlopen('http://j.mp/wand-iu-2')) as image:
    image.save(filename='wand-iu-2.jpg')
    assert image.size == (720, 887)
    with image[:230, :] as cropped:
    cropped.save(filename='cropped.jpg')
    

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21. Cropping
    

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22. Cropping
    

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23. 0.3 will be soon
    It will include:
    ● Python 3 compatibility
    ● Drawing
    ● Sequences
    ● EXIF
    ● Seam carving
    ● Channels
    ● and so on
    http://dahlia.kr/wand/roadmap.html
    

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24. Seam carving
    

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25. Seam carving
    from urllib2 import urlopen
    from wand.image import Image
    with Image(file=urlopen('http://j.mp/wand-iu-3')) as i:
    i.save(filename='wand-iu-3.jpg')
    assert i.size == (1280, 1710)
    i.liquid_rescale(1280, 1500)
    i.save(filename='seam-carving.jpg')
    

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26. Seam carving
    

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27. Seam carving
    

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28. Further reading
    http://dahlia.kr/wand/
    

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29. Fork/pull request
    https://github.com/dahlia/wand
    

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30. Discussion
    wand@librelist.com
    http://librelist.com/browser/wand/
    

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31. Talk permalink
    http://j.mp/pykr2012-wand
    

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