qimage2ndarray is a small python extension for quickly converting between QImages and numpy.ndarrays (in both directions). These are very common tasks when programming e.g. scientific visualizations in Python using PyQt4 as the GUI library.

• Supports conversion of scalar and RGB data, with arbitrary dtypes and memory layout, with and without alpha channels, into QImages (e.g. for display or saving using Qt).

• Using a tiny C++ extension, qimage2ndarray makes it possible to create ndarrays that are views into a given QImage's memory.

  This allows for very efficient data handling and makes it possible to modify Qt image data in-place (e.g. for brightness/gamma or alpha mask modifications).

• qimage2ndarray is stable and unit-tested.
• Masked arrays are also supported and are converted into QImages with transparent pixels.
• Supports value scaling / normalization to 0..255 for convenient display of arbitrary NumPy arrays.

The extension is open source, BSD-licensed, and the repository can be browsed online or cloned using Git:

git clone https://github.com/hmeine/qimage2ndarray.git

Documentation can be found in the doc/ subdirectory or on GitHub:

http://hmeine.github.io/qimage2ndarray

This extension is written and maintained by Hans Meine <hans_meine@gmx.net>.

I am grateful for feedback from Ullrich Köthe and PowerPC/endianness testing by Helge Kreutzmann.