Imaging libraries in active development?

[Alasdair McAndrew]

I'm investigating Python for image processing (having used Matlab, then Octave for some years). And I'm spoiled for choice: PIL and its fork pillow, scipy.ndimage, scikits-image, mahotas, the Python interface to openCV...

However, PIL doesn't seem to be in active development. What I want to know is - what are the current "standard" libraries for image processing in Python which are in active development?

I have quite a few image processing student notes which I'm thinking of converting to Python, but I'd like to use the most up-to-date library.

Thanks,
Alasdair

 

[Jorgen Grahn]

Am 28.11.2012 19:14, schrieb Michael Torrie:

Not to me -- the slower the change, the better!

PIL is missing a bunch of features like proper TIFF support (no
multipage, g3/g4 compression and more), JPEG 2000,

I thought those formats were dead since about a decade? (Ok, I know
TIFF has niches, but JPEG 2000?)

RAW and HDR image
formats, tone mapping, proper ICC support, PEP 3128 buffer support ...

I won't comment on those, but they seem likely to be valid complaints.

PIL is also rather slow. My smc.freeimage library can write JPEGs about
six times faster, because it uses libjpeg-turbo. Only some Linux
distributions have replaced libjpeg with the turbo implementation.

That seems like an argument for *not* having support for many file
formats in the imaging library itself -- just pipeline into the best
standalone utilities available.

/Jorgen

 

[Alasdair McAndrew]

I take your point that not being actively developed doesn't necessarily mean that the software is bad - but in general healthy software is continuously updated and expanded to meet the needs of its users, or to take advantageof new algorithms or hardware.

And in its current form PIL has a number of limitations: it doesn't allow linear filters of arbitrary size or shape, or non-linear filters (such as median filter) of arbitrary size. There doesn't seem to be built in support for standard imaging filters: Gaussian, Laplacian, LoG, edge detection, unsharp masking and so on. It doesn't seem to have support for color space conversions (RGB, YIQ, HSV etc). There don't seem to be standard edge detection routines (Laplacian of Gaussian, Canny, etc). And so on. Now maybe some of these can be found in other Python libraries, but I can't imagine I'm the only person who would ever want them in an imaging library. Other libraries (scipy.ndimage, scikits-image) do go a long way to addressing my concerns.

Anyway, I was curious to know why PIL is lacking so much of what I would consider fairly fundamental imaging facilities, and why development seems to have stalled since 2009.

 

[zoom]

C'mon guys, don't be so picky.
The point is that that he cannot find python library that can easily
create HDR image or process RAW images (or some other image format).
Also, AFAIK there is no built in support for standard imaging filters,
color space conversion, etc (as Alasdair also mentioned). One can do
this with scipy, and this is how I do it. But I'm also interested if
there is some library that implements any of those. IMHO it would be
useful if one could code the same effects easily as clicking on the
effect button in GIMP or Blender.
This is interesting question, and if any of you have any ideas on how
this can be achieved, please share your knowledge with us.

P.S.
We do not need to tutor people about whether a RAW format is a specific
image format or not (http://en.wikipedia.org/wiki/Raw_image_format) - we
understand the point of his question albeit it is not clearly stated.
Assume good will - nobody is stating that PIL or scipy are bad, we
simply ask whether there is something more out there.

It would be more useful if we would provide information on how to do it,
or connect him with someone who can do it. Or point where he can request
such feature or publish his solution. The policy not to implement every
format under the sky is a legal one, but by implementing it one-by-one -
together we might even get there.

 

[Alasdair McAndrew]

Thanks for the heads-up about OpenCV. I have in fact briefly looked at OpenCV (well, the documentation), and it does seem remarkably complete. And what it doesn't provide, such as image transforms (FFT, DCT etc), are offered elsewhere by other Python libraries.

Probably the combinations of OpenCV, Scipy.ndimage and scikits-image would cover pretty much all of my needs.

Thanks,
Alasdair

 

[Alasdair McAndrew]

Thanks for the heads-up about OpenCV. I have in fact briefly looked at OpenCV (well, the documentation), and it does seem remarkably complete. And what it doesn't provide, such as image transforms (FFT, DCT etc), are offered elsewhere by other Python libraries.

Probably the combinations of OpenCV, Scipy.ndimage and scikits-image would cover pretty much all of my needs.

Thanks,
Alasdair

 

[Nobody]

What I want to know is - what are the current "standard" libraries for
image processing in Python which are in active development?

NumPy/SciPy.

PIL is fine for loading/saving image files (although if you're using a GUI
toolkit, that probably has its own equivalents). But for any non-trivial
processing, I normally end up using either NumPy or (if speed is an issue)
PyOpenGL/GLSL.