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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.

http://freeimage.sourceforge.net/

  • 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.

http://www.littlecms.com/

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.so (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 http://www.libjpeg-turbo.org/About/Performance 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 https://bitbucket.org/tiran/freeimageturbo

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 https://bitbucket.org/tiran/smc.freeimage .

Authors

Christian Heimes

Dirk Rothe (testing and proposals)

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