imagecodecs 2018.11.8

Image transformation, compression, and decompression codecs

Imagecodecs is a Python library that provides block-oriented, in-memory buffer transformation, compression, and decompression functions for use in the tifffile, czifile, and other scientific imaging modules.

Decode and/or encode functions are currently implemented for Zlib DEFLATE, ZStandard, Blosc, LZMA, BZ2, LZ4, LZW, LZF, PNG, WebP, JPEG 8-bit, JPEG 12-bit, JPEG SOF3, JPEG LS, JPEG 2000, JPEG XR, PackBits, Packed Integers, Delta, XOR Delta, Floating Point Predictor, and Bitorder reversal.

Author:

Christoph Gohlke

Organization:

Laboratory for Fluorescence Dynamics. University of California, Irvine

Version:

2018.11.8

Requirements

• CPython 2.7 or 3.5+

• Numpy 1.14

• Cython 0.28

• zlib 1.2.11

• lz4 1.8.3

• zstd 1.3.7

• blosc 1.14.4

• bzip2 1.0.6

• xz liblzma 5.2.4

• liblzf 3.6

• libpng 1.6.35

• libwebp 1.0

• libjpeg-turbo 2.0 (8 and 12-bit)

• charls-2.0.0

• openjpeg 2.3

• jxrlib 0.2.1

• A Python distutils compatible C compiler

Notes

Imagecodecs is currently developed, built, and tested on Windows only.

The API is not stable yet and might change between revisions.

Works on little-endian platforms only.

Python 2.7 and 3.4 are deprecated.

Refer to the imagecodecs/licenses folder for 3rd party library licenses.

This software is based in part on the work of the Independent JPEG Group.

This software includes a modified version of jpg_0XC3.cpp.

Other Python packages providing imaging or compression codecs:

• numcodecs

• python-blosc

• Python zlib

• Python bz2

• Python lzma and backports.lzma

• python-snappy

• python-brotli

• python-lzo

• python-lz4

• python-zstd

• python-lzw

• python-lzf

• packbits

Revisions

2018.11.8

Pass 1323 tests. Decode LSB style LZW. Fix last byte not written by LZW decoder (bug fix). Permit unknown colorspaces in JPEC codecs (e.g. CFA used in TIFF).

2018.10.30

Add JPEG 8-bit and 12-bit encoders. Improve color space handling in JPEG codecs.

2018.10.28

Rename jpeg0xc3 to jpegsof3. Add JPEG LS codec via libcharls. Fix missing alpha values in jxr_decode. Fix decoding JPEG SOF3 with multiple DHTs.

2018.10.22

Add Blosc codecs via libblosc.

2018.10.21

Builds on Ubuntu 18.04 WSL. Include liblzf in srcdist. Do not require CreateDecoderFromBytes patch to jxrlib.

2018.10.18

Improve jpeg_decode wrapper.

2018.10.17

Add JPEG SOF3 decoder based on jpg_0XC3.cpp.

2018.10.10

Add PNG codecs via libpng. Add option to specify output colorspace in JPEG decoder. Fix Delta codec for floating point numbers. Fix XOR Delta codecs.

2018.9.30

Add LZF codecs via liblzf.

2018.9.22

Add WebP codecs via libwebp.

2018.8.29

Pass 396 tests. Add PackBits encoder.

2018.8.22

Add link library version information. Add option to specify size of LZW buffer. Add JPEG 2000 decoder via openjpeg. Add XOR Delta codec.

2018.8.16

Link to libjpeg-turbo. Support Python 2.7 and Visual Studio 2008.

2018.8.10

Initial alpha release. Add LZW, PackBits, PackInts and FloatPred decoders from tifffile.c module. Add JPEG and JPEG XR decoders from czifile.pyx module.