Pure Python imaging library with Python 2.6, 2.7, 3.1+ support
Home Page: http://pymaging.rtfd.org
License: Other
Pure Python imaging library.
Thanks to @katylava for helping me pick the name
I've been trying to flip an image both horizontally and then vertically in order to achieve a 180 degree rotation.
Using
flipped_horizontally_image = image.flip_left_right()
flipped_vertically_image = flipped_horizontally_image.flip_top_bottom()
the resulting image has the the same vertical orientation as the original image.
If I only use flip_left_right(), I find that the image is already flipped vertically in addition to horizontally, so flip_top_bottom() just ends up canceling out the vertical flip.
Add JPG read and write support
maybe nicer than rolling our own https://github.com/mattrobenolt/colors.py
It would be great that if this is to be a drop-in replacement for PIL, there's a clear path to configure your venv/app for such.
Images should be lazily/multi-phase loaded: Load headers, then load image data progressively when needed.
Add an Image.thumbnail function. Maybe with fancy stuff such as focal points?
Downloading pymaging via git is unfriendly and insecure. It's unsuitable for production use and makes it improper to depend on it from any other Python package.
Please wrap up a proper release and upload it to pypi so that we could install it via pip easily and dep on it from other packages without deferring it to the VCS.
According to @alex array.array('B', [0]) * bignum is faster than array.array('B', [0] * bigname). Need to fix that.
(see https://twitter.com/alex_gaynor/status/265890088251174913)
I added a test case to resize up (2x2 to 4x4) and got this:
ERROR: test_resize_nearest_resampling_up (pymaging.tests.test_resampling.ResizeNearestResamplingTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/Users/cdestigter/checkout/pymaging/pymaging/tests/test_resampling.py", line 23, in test_resize_nearest_resampling_up
img = img.resize(4, 4)
File "/Users/cdestigter/checkout/pymaging/pymaging/image.py", line 101, in resize
pixels = resample_algorithm(self, width, height, self.pixelsize)
File "/Users/cdestigter/checkout/pymaging/pymaging/resample.py", line 46, in nearest
lineextend(source.pixels[source_y][source_x_start:source_x_end])
IndexError: list index out of range
Fix forthcoming
jpeg write support
see pymaging.tests.BasicTests.test_color_mix_with
When trying to run the quickstart example,
from pymaging import Image
img = Image.open_from_path('myimage.png')
img = img.resize(300, 300)
img.save('resized.png')the program halts with an I/O operation on closed file error.
It can be circumvented as follows:
Image.open(file('myimage.png','rb'))If an image has a palette, anti-alias techniques used in the draw method or resize currently break almost all the time. Need to find a good solution to handle this.
I get the following:
>>> from pymaging.image import Image
>>> img_part = Image.open_from_path('spheres/peter5/images/peter5_0_0_0.jpg')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "src/pymaging/pymaging/image.py", line 62, in open_from_path
return cls.open(fobj)
File "src/pymaging/pymaging/image.py", line 57, in open
raise FormatNotSupported()
pymaging.exceptions.FormatNotSupported
write a good and working setup.py script. figure out how to handle incubator in that.
======================================================================
ERROR: test_non_indexed_interlaced (pymaging.incubator.formats.tests.PNGTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/jonas/workspace/pymaging/pymaging/incubator/formats/tests.py", line 56, in test_non_indexed_interlaced
img = Image.open_from_path(_get_filepath('black-white-non-indexed-interlaced-adam7.png'))
File "/home/jonas/workspace/pymaging/pymaging/image.py", line 62, in open_from_path
return cls.open(fobj)
File "/home/jonas/workspace/pymaging/pymaging/image.py", line 54, in open
image = format.open(fileobj)
File "/home/jonas/workspace/pymaging/pymaging/incubator/formats/png.py", line 37, in open
return reader.get_image()
File "/home/jonas/workspace/pymaging/pymaging/incubator/formats/png_reader.py", line 353, in get_image
handler(chunk_data, chunk_length)
File "/home/jonas/workspace/pymaging/pymaging/incubator/formats/png_reader.py", line 482, in handle_chunk_IHDR
self.adam7 = Adam7(self)
File "/home/jonas/workspace/pymaging/pymaging/incubator/formats/png_reader.py", line 244, in __init__
self.init()
File "/home/jonas/workspace/pymaging/pymaging/incubator/formats/png_reader.py", line 261, in init
self.current_y = self.yiter.next()
AttributeError: 'itertools.islice' object has no attribute 'next'
I'm testing the lib and, both in Python 2.7 and Python 3.2, when I use img.save_to_path(), I get this exception:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/marco/Desktop/virtualenvs/py32/src/pymaging/pymaging/image.py", line 76, in save_to_path
self.save(fobj, format)
File "/Users/marco/Desktop/virtualenvs/py32/src/pymaging/pymaging/image.py", line 70, in save
format_object.encode(self, fileobj)
File "/Users/marco/Desktop/virtualenvs/py32/src/pymaging-png/pymaging_png/png.py", line 46, in encode
writer.write(fileobj, image.pixels)
File "/Users/marco/Desktop/virtualenvs/py32/src/pymaging-png/pymaging_png/raw.py", line 631, in write
nrows = self.write_passes(outfile, rows)
File "/Users/marco/Desktop/virtualenvs/py32/src/pymaging-png/pymaging_png/raw.py", line 755, in write_passes
enumrows = enumerate(rows)
TypeError: 'PixelArray3' object is not iterable
(I'm testing with png images, after installing png support)
I just tested the resize image sample code on the website (using save_to_path(9 instead of save()):
from pymaging import Image
img = Image.open_from_path('myimage.png')
img = img.resize(300, 300)
img.save_to_path('resized.png')
"""
Have to change code in image.py so file is not prematurely closed:
def open_from_path(cls, filepath):
#jtk with open(filepath, 'rb') as fobj:
fobj = open(filepath, 'rb') # jtk
return cls.open(fobj)
Have to change Quickstart example
http://pymaging.readthedocs.org/en/latest/usr/quickstart.html
to cleanup after resize().
Also, save() does not work
"""
from pymaging import Image
img = Image.open_from_path('test1-960x720.png')
img = img.resize(300, 300)
img.width, img.height = 300,300
img.save_to_path('test1-300x300.png')
I want to use this module in an app I'm working on for BB10 (https://github.com/krruzic/snappy) but this line in formats.py is making it not work. setup_tools isn't available on BlackBerry obviously and I don't even get what you're doing with it here. Any advice on how I could get it to work or what's going on would be appreciated.
ERROR: test_format_registration (pymaging.tests.test_basic.DrawTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/mgorny/git/pymaging/pymaging/tests/test_basic.py", line 301, in test_format_registration
self.assertIsInstance(img, Image)
AttributeError: 'DrawTests' object has no attribute 'assertIsInstance'
----------------------------------------------------------------------
The assertIsInstance() function is not available in Python 2.6. Possible solutions:
unittest2.TestCase as base class in Python 2.6,assertTrue(isinstance(...)) or something similar.Re-Implement the PNG Writer to be faster
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