Purely Python Imaging with Pymaging

A little over a year ago, frustration with the state of image processing in Python led me to start a project called pymaging. Pymaging is a pure Python image processing library that works on Python 2.x and 3.x. This talk will dive into why I started this project, how I dug into the problems, what I learned about image formats and my goals for the future of this project.

Transcript

1. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 1/28 PURELY PYTHON IMAGING WITH PYMAGING PyCon US 2013 Jonas Obrist
2. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 2/28 JONAS OBRIST github.com/ojii twitter.com/ojiidotch ojiidotch@gmail.com django CMS core developer DjangoCon Europe 2012 Organizer Python Enthusiast
3. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 3/28 NO IDEA ABOUT DIGITAL IMAGING Can't code C Can barely read C Had no idea how images work
4. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 4/28 GOALS OF PYIMAGING Pure Python solution for common* imaging tasks Easily installable Easy to use Easy to hack Easy to extend Support for Python 2 and 3
5. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 5/28 ORIGINS OF PYMAGING December 21st 2011 #django-cms on freenode "Installing PIL is hard" < o j i i > a n d I d o n ' t g e t h o w n o o n e c a m e u p w i t h a n a l t e r n a t i v e y e t < o j i i > i s t h a t r e a l l y T H A T h a r d ? < o j i i > a n d d o e s i t r e a l l y * N E E D * C ? < k e z a b e l l e > s o u n d s l i k e y o u ' r e v o l u n t e e r i n g ; ) < o j i i > h a h < o j i i > i w i s h i c o u l d < T r i b a a l > I t h i n k s o m e b o d y j u s t h a s t o d o i t
6. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 6/28 EARLY RESISTANCE "Not Fast Enough" < G o t e n X i a o > o j i i : t h e p r o b l e m i s t h a t p u r e P y t h o n r u n n i n g o n C P y t h o n i s n ' t f a s t e n o u g h < T r i b a a l > p y p y : ) < o j i i > p y p y !
7. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 7/28 I TRIED IT ANYWAY (Shoutout to @katylava for picking the name!)
8. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 8/28 EARLY APPROACH Porting PIL C code line-by-line Previous success with this approach PIL proofed to be too complicated
9. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 9/28 THE HOLY GRAIL Google
10. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 10/28 EXISTING (PURE) PYTHON LIBRARIES PNG GIF* JPEG ...
11. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 11/28 LICENSE HELL All GIF libraries are GPL
12. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 12/28 GLUING THINGS TOGETHER Different library maturities Different internal storage But working proof-of-concept end of January 2012
13. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 13/28 HOW PYMAGING WORKS Core provides APIs Packages provide format support
14. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 14/28 FORMATS Register through setuptools entry points Provide an encoder and/or decoder Separate from the main package
15. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 15/28 CORE Defines the internal data structure Defines the API Keeps track of installed formats Implements basic algorithms
16. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 16/28 HOW IMAGES ARE STORED INTERNALLY P i x e l A r r a y and friends Flat a r r a y . a r r a y of pixel data High-level API to manipulate pixels and the canvas
17. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 17/28 STATE OF PYMAGING
18. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 18/28 FORMATS PNG encoding/decoding JPG decoding (broken) BMP decoding PSD (by Mikhail Korobov)
19. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 19/28 APIS Resize/Crop (Thumbnailing) Affine transforms (thanks Craig de Stigter) Rotation Drawing Blit (merging)
20. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 20/28 PYTHON 3 Python 2.6 ~ 3.3 Not as hard as I thought Pymaging only handles bytes, not strings New libraries should really support 3!
21. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 21/28 LESSONS LEARNED Imaging is hard... ...but not impossible!
22. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 22/28 FORMATS Level of documentation varies a lot! PNG is amazing! BMP is weird JPEG is complicated GIF is really close to being easy
23. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 23/28 PYPY IS AWESOME The primary "speed" strategy Very helpful developers They fix PyPy if you find slow parts
24. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 24/28 YOU'RE NOT THE FIRST Chances are somebody tried before Google! Build on others work
25. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 25/28 FUTURE Fix JPEG Fix bugs Delayed loading
26. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 26/28 I NEED HELP You can most likely contribute Pick a format, implement it Pick a format, fix it Ask me for help
27. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 27/28 PYCON SPRINTS Come talk to me
28. 3/17/13 reveal.js - The HTML Presentation Framework file:///home/jonas/Ubuntu One/presentations/pymaging/local/index.html#/ 28/28 THANK YOU / QUESTIONS? github.com/ojii/pymaging github.com/ojii/pymaging-png github.com/ojii/pymaging-bmp github.com/ojii/pymaging-jpg twitter.com/ojiidotch ojiidotch@gmail.com github.com/ojii