Python wrapper for FreeImage and LCMS2 libraries

freeimage, lcms, image, jpeg, tiff, png, pil, icc
pip install smc.freeimage==0.2


======================================================= smc.freeimage - Semantics' FreeImage wrapper for Python ======================================================= smc.freeimage is a Python interface to the FreeImage and LCMS2 libraries. Features of FreeImage ===================== FreeImage wraps mature and widely-used libraries like LibJPEG, LibOpenJPEG, LibPNG, LibRaw, LibTIFF4, OpenEXR and zlib in a consistent, well documented and powerful API. * Reading of 35 file formats and writing of more than 19 file formats as of FreeImage 3.15.3, including JPEG 2000, multiple subformats of TIFF with G3/G4 fax compression and JPEG subsampling. * pixel depths from 1-32 bpp standard images up to formats like RGBAF and 2x64complex. * multi page images * Metadata (e.g. EXIF, IPTC/NAA, GeoTIFF, XMP) and ICC * Color adjustment, conversion and channel processing * Image resizing and rotation * High Dynamic Range (HDR) image processing and tone mapping * RAW camera files Contrary to PIL it doesn't contain advanced image filters or drawing functions. FreeImage focuses on file formats Features of LCMS2 ================= LCMS2 is a color management engine that implements V2 and V4 ICC profiles up to V4.3. It supports transformation, proofing and introspection of profiles for a large variety of color formats and targets. Features of smc.freeimage ========================= smc.freeimage is developed as part of the closed source Visual Library framework. * mostly written with Cython with some lines of handwritten C Code and some Python helpers. * fast, it avoids copying large amounts of data and releases the GIL whenever possible. * 64bit safe, tested on i386/X86 and AMD64/X86_64 systems * thread safe * wraps a large subset of FreeImage features * compatible with Python 2.6 to 3.3. Performance =========== smc.freeimage with libjpeg-turbo read JPEGs about three to six times faster than a standard build of PIL and writes JPEGs more than five times faster. By default PIL is compiled against the standard libjpeg library. Some Linux distributions have started to install libjpeg-turbo as (libjpeg-turbo has a libjpeg v8 compatible ABI). On these platforms PIL is almost as fast as smc.freeimage. JPEG's restart markers are not compatible with libjpeg-turbo's Huffman decoder optimization and reduce performance a lot. Please read the section "Restart Makers" on the page for more information. Python: 2.7.3 read / write cycles:: 300 test image: 1210x1778 24bpp JPEG (pon.jpg) platform: Linux 64bit hardware: Intel Xeon hexacore W3680@3.33GHz with 24 GB RAM smc.freeimage, FreeImage 3.15.3 (with standard libjpeg) ------------------------------------------------------- - read JPEG 12.857 sec - read JPEG 6.629 sec (resaved) - write JPEG 21.817 sec smc.freeimage, FreeImage 3.15.3 (with libjpeg-turbo) ---------------------------------------------------- - read JPEG 9.297 sec - read JPEG 3.909 sec (resaved) - write JPEG 5.857 sec - read LZW TIFF 17.947 sec - read biton G4 TIFF 2.068 sec - resize 3.850 sec (box) - resize 5.022 sec (bilinear) - resize 7.942 sec (bspline) - resize 7.222 sec (bicubic) - resize 7.941 sec (catmull rom spline) - resize 10.232 sec (lanczos3) - tiff numpy.asarray() with bytescale() 0.006 sec - tiff load + numpy.asarray() with bytescale() 18.043 sec PIL 1.1.7 (with standard libjpeg) --------------------------------- - read JPEG 30.389 sec - read JPEG 23.118 sec (resaved) - write JPEG 34.405 sec - read LZW TIFF 21.596 sec - read biton G4 TIFF: decoder group4 not available - resize 0.032 sec (nearest) - resize 1.074 sec (bilinear) - resize 2.924 sec (bicubic) - resize 8.056 sec (antialias) - tiff scipy fromimage() with bytescale() 1.165 sec - tiff scipy imread() with bytescale() 22.939 sec PIL 1.1.7 (with libjpeg-turbo) ------------------------------ - read JPEG 9.403 sec - read JPEG 4.696 sec (resaved) - write JPEG 6.165 sec pgmagick 0.5.3 (GraphicsMagick 1.3.x) with default libjpeg ---------------------------------------------------------- - read JPEG 31.487 sec - read JPEG 24.047 sec (resaved) - write JPEG 38.643 sec - read LZW TIFF 20.476 sec - read biton G4 TIFF 15.224 sec - resize 1.412 sec (BoxFilter) - BUG: pgmagick ignores all filter settings for filterType() pgmagick 0.5.3 (GraphicsMagick 1.3.x) (with libjpeg-turbo) ----------------------------------------------------------- - read JPEG 9.221 sec - read JPEG 4.522 sec (resaved) - write JPEG 8.595 sec Comparison to PIL (Pros and Cons) ================================= Pros of smc.freeimage --------------------- * Faster! JPEG performance is about 3 to 6 times faster than PIL, numpy buffer access is more than 100 times faster and consumes less memory due to zero copy design. * Modern file formats! smc.freeimage supports JPEG 2000, HDR and EXR high dynamic range images and raw camera data (RAW). * Full baseline TIFF support! Contrary to PIL smc.freeimage supports all flavors of baseline TIFF like G3 and G4 compression and multipage TIFFs. * PEP 3118 buffer interface that exports images as 2d or 3d non-contiguous buffer. * Correct and optimized integration of a color management system (LittleCMS2) instead of lcms1 integration including caching of optimized transformations, in-place transformation and introspection of profiles. * Structured metadata access to EXIF, XMP and IPTC information, also supports fast loading of metadata without loading pixel data. * Lot's of color types! Bitmap (8bit) with 1, 4, 8, 16, 24 and 32 bits per pixel, (unsigned) int 16 and 32, float, double gray scale, complex, RGBA 16bit and RGBA floats. * Static build support, no need for "make install". You just need a C99 compatible C/C++ compiler, make and nasm (for FreeImage-Turob). Cons of smc.freeimage ---------------------- * Few image filters, no support for complex image filters in FreeImage * Low quality resize filters are slower than PIL's filters * No drawing API for primitives (lines, circles, boxes) * No text drawing support and libfreetype integration. * Still not feature complete and under development. FreeImage + libjpeg-turbo ========================= An experimental fork of FreeImage with libjpeg-turbo is available at Testdata and Windows build files ================================ Neither the Windows build files nor the test images are included in the source distribution. All files can be downloaded from . Authors ======= Christian Heimes Dirk Rothe (testing and proposals) Copyright ========= Copyright (C) 2008-2012 semantics GmbH. All Rights Reserved.:: semantics Kommunikationsmanagement GmbH Viktoriaallee 45 D-52066 Aachen Germany Tel.: +49 241 89 49 89 29 eMail: info(at)