PurePNG

PurePNG provides Python code for encoding/decoding PNG files. In particular png.py is a Python module written entirely in Python.

PurePNG home page: http://github.com/scondo/purepng/

PurePNG documentation: http://purepng.readthedocs.org/en/latest/

QUICK START

import png
png.from_array([[255, 0, 0, 255],
                [0, 255, 255, 0]], 'L').save("small_smiley.png")

After that, try "import png" then "help(png)".

INSTALLATION

PurePNG requires Python version 2.3 (and that's all), or any compatible higher version(incl. Python 3). It works best on Python 2.6 and above.

PurePNG comes with a setup.py script to use with distutils. After unpacking the distribution, cd into the directory and execute the command:

python setup.py install

The png module will be installed; "import png" will allow you to use it from your Python programs.

Alternatively, you can copy code/png/png.py wherever you like. It's intended that you can copy png.py into your application and distribute it. The following "curl" command should copy the latest version into your current directory:

curl -LO https://raw.github.com/scondo/purepng/master/code/png.py

MIGRATION FROM PYPNG

PurePNG is successor of PyPNG - nice and simple module to work with png.

If you work with PyPNG in most cases you can use PurePNG as drop-in replace, but few things are changed:

Rows in boxed flat row now may be any buffer-compatible, not only array. Use str(buffer(row)) instead of 'tostring' method or memoryview(row).
Python 2.2 support removed. Too much important features (like deinterlace) fails on Python 2.2. Now all version should pass all tests.
Work with Netpbm images using only copied 'png.py' deprecated. (will be removed soon)

RELEASE NOTES

(For issues see https://github.com/scondo/purepng/issues?state=open )

PurePNG 0.2.0

Kind of stable release Minor bugfixes(mostly installation)

PurePNG 0.1.2

Fixing installation problems cause by cython/unimport

PurePNG 0.1.1 New chunks

Raw iCCP read/write
cHRM and sRGB support
pHYs support
Text information (read tEXt and zTXt, write tEXt)
partitially iTXt
Bugfixes
Tests
Continious integration

See https://github.com/Scondo/purepng/compare/0.1.0...Scondo:0.1.1

PurePNG 0.1.0 Initial rework led to fork.

Reworked Cython concept.
Add optional filtering on save.
Module/package duality
Python 2/3 polyglot (and partitial Cython)
Using bytearray when possible.
PIL plugin

PyPNG release history:

Release 0.0.16

Compatible with nose: nosetests png.py now works.

Allow any "file-like" object as an input.

Handle newlines in texttopng.

Release 0.0.15

Fixed various URLs to point at github.com instead of googlecode.

Release 0.0.14

When using png.py as a command line tool, it can now produce non-square test images.

PyPNG now installs "out of the box" on Python 3 on a plain install (previously distribute or pip was required).

PyPNG welcomes the following community contributions:

Joaquín Cuenca Abela speeds up PNG reading when Cython is available.
Josh Bleecher Snyder adds a lenient mode which has relaxed checksum checking.
nathan@dunfield.info fixed a problem writing files when using the command line tool on Windows (Issue 62).