Packages with the jpeg2k use flag

Global definition: Support for JPEG 2000, a wavelet-based image compression format.

app-text / ghostscript-gpl : Interpreter for the PostScript language and PDF

app-text / poppler : PDF rendering library based on the xpdf-3.0 code base

dev-libs / efl : Enlightenment Foundation Libraries all-in-one package

dev-python / pillow : Python Imaging Library (fork)

media-gfx / blender : 3D Creation/Animation/Publishing System

media-gfx / darktable : A virtual lighttable and darkroom for photographers

media-gfx / engauge : Convert an image file showing a graph or map into numbers

media-gfx / gimp : GNU Image Manipulation Program

media-gfx / imagemagick : A collection of tools and libraries for many image formats

media-libs / freeimage : Image library supporting many formats

media-libs / leptonica : C library for image processing and analysis

media-libs / opencv : A collection of algorithms and sample code for various computer vision problems

media-libs / openimageio : A library for reading and writing images

media-video / ffmpeg : Complete solution to record/convert/stream audio and video. Includes libavcodec

media-video / gpac : Implementation of the MPEG-4 Systems standard developed from scratch in ANSI C

net-libs / webkit-gtk : Open source web browser engine

sci-libs / eccodes : A set of encoding/decoding APIs and tools for WMO GRIB, BUFR, and GTS messages

sci-libs / gdal : Translator library for raster geospatial data formats (includes OGR support)