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Subject: OpenEXR


From: Marzio Veneman <max.rythmos<-a>
Date: Monday, June 23, 2008
With reference to moving picture conservation and enhancement, I
take pleasure informing you as follows:


OpenEXR is a high dynamic-range (HDR) image file format developed by
Industrial Light and Magic for use in computer imaging applications.


    **** Moderator's comments: From the OpenEXR site:

       "OpenEXR is used by ILM on all motion pictures currently in
        production. The first movies to employ OpenEXR were Harry
        Potter and the Sorcerers Stone, Men in Black II, Gangs of
        New York, and Signs. Since then, OpenEXR has become ILM's
        main image file format.

        "OpenEXR's features include:

           "Higher dynamic range and color precision than existing
            8- and 10-bit image file formats.

            Support for 16-bit floating-point, 32-bit
            floating-point, and 32-bit integer pixels. The 16-bit
            floating-point format, called "half", is compatible with
            the half data type in NVIDIA's Cg graphics language and
            is supported natively on their new GeForce FX and Quadro
            FX 3D graphics solutions.

            Multiple lossless image compression algorithms. Some of
            the included codecs can achieve 2:1 lossless compression
            ratios on images with film grain.

            Extensibility. New compression codecs and image types
            can easily be added by extending the C++ classes
            included in the OpenEXR software distribution. New image
            attributes (strings, vectors, integers, etc.) can be
            added to OpenEXR image headers without affecting
            backward compatibility with existing OpenEXR

       "ILM has released OpenEXR as free software. The OpenEXR
        software distribution includes:

            IlmImf, a library that reads and writes OpenEXR images.

            Half, a C++ class for manipulating half values as if
            they were a built-in C++ data type.

            Imath, a math library with support for matrices, 2d- and
            3d-transformations, solvers for linear/quadratic/cubic
            equations, and more.

            exrdisplay, a sample application for viewing OpenEXR
            images on a display at various exposure settings."

Marzio Veneman
Rythmos Creative Advisory
International professional business services, accountancy, taxation,
GIS, automation, theatre, and art conservation
The Netherlands

                  Conservation DistList Instance 22:2
                   Distributed: Monday, June 23, 2008
                        Message Id: cdl-22-2-002
Received on Monday, 23 June, 2008

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