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Open Source Computer Vision Library
https://opencv.org/
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124 lines
4.4 KiB
124 lines
4.4 KiB
15 years ago
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ABOUT THE OPENEXR LIBRARIES
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----------------------------
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Half is a class that encapsulates our 16-bit floating-point format.
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IlmThread is a thread abstraction library for use with IlmImf. It
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currently supports pthreads and Windows threads.
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IlmImf is our "EXR" file format for storing 16-bit FP images.
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Imath is a math library. IlmImf only uses a subset of it,
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but we're releasing the full library because it's easier for us to
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maintain, and we think it'll be useful to others.
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Iex is an exception-handling library.
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See the IlmImfExamples directory for some code that demonstrates how
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to use the IlmImf library to read and write OpenEXR files. The doc
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directory contains some high-level documentation and history about the
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OpenEXR format.
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If you have questions about using the OpenEXR libraries, you may want
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to join our developer mailing list. See http://www.openexr.com for
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details.
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LICENSE
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-------
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The OpenEXR source code distribution is free software. See the file
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named COPYING (included in this distribution) for details.
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WHAT'S INCLUDED
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---------------
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Besides the core OpenEXR libraries, the release includes several
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utilities for reading, writing, viewing, and manipulating OpenEXR
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images. These include:
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* exrdisplay, an image viewer.
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* exrheader, a utility for dumping header information.
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* exrstdattr, a utility for modifying OpenEXR standard attributes.
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* exrmaketiled, for generating tiled and rip/mipmapped images.
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* exrenvmap, for creating OpenEXR environment maps.
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* exrmakepreview, for creating preview images for OpenEXR files.
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exrdisplay requires FLTK 1.1 or greater and OpenGL. exrdisplay
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supports fragment shaders if you have the Nvidia Cg SDK and a graphics
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card capable of running fp30 profile fragment shaders. See
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exrdisplay/README for details.
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We have also released an OpenEXR display driver for Renderman, a file
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I/O plugin for Shake, and a file I/O plugin for Adobe Photoshop (on
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both Windows and MacOS). These are packaged separately. Go to
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http://www.openexr.com to download them. NOTE: the most recent
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versions of these applications now have native support for OpenEXR, so
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you should only use our open-source versions of the plugins if you
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have an older version of the application.
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BUILDING OPENEXR
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----------------
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Building OpenEXR requires the zlib library. If you want to build the
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'exrdisplay' image viewer, you'll also need FLTK 1.1, but this program
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is not required to use OpenEXR's libraries in your application.
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exrdisplay can also accelerate the display of OpenEXR images if you
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have the NVIDIA Cg SDK.
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Your OS distribution may already include these libraries, or supply
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packages for them. That is the preferred way to obtain them for use
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with OpenEXR. If not, you can obtain the source code for zlib and
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FLTK from:
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http://www.zlib.net
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http://www.fltk.org
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and you can download the NVIDIA Cg SDK from
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http://developer.nvidia.com.
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If you're building OpenEXR on a Windows platform, see README.win32 for
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instructions on how to build OpenEXR. The remainder of this file
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applies only to GNU/Linux or other UNIX-like systems.
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After installing the required libraries, to build OpenEXR on
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GNU/Linux or other UNIX-like systems, do this:
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./configure
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make
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make install
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unless you obtained OpenEXR directly from CVS, in which case you
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should first read README.CVS.
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If you have the Nvidia Cg SDK and you want to build support for
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fragment shaders into exrdisplay, specify the path to the SDK using
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the "--with-cg-prefix" flag. There are some additional compile-time
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configuration options available; type `./configure --help` for more
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information.
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See README.OSX for details on building OpenEXR in MacOS X.
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Do `make check` to run the OpenEXR confidence tests. They should all
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pass; if you find a test that does not pass on your system, please let
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us know.
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Other UNIX variants haven't been tested, but should be easy to build.
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Let us know if you're having problems porting OpenEXR to a particular
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platform.
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All include files needed to use the OpenEXR libraries are installed in the
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OpenEXR subdirectory of the install prefix, e.g. /usr/local/include/OpenEXR.
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USING OPENEXR IN YOUR APPLICATIONS
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----------------------------------
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On systems with support for pkg-config, use `pkg-config --cflags
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OpenEXR` for the C++ flags required to compile against OpenEXR
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headers; and `pkg-config --libs OpenEXR` for the linker flags required
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to link against OpenEXR libraries.
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