[Openexr-devel] Interpreting Deep

[Florian Kainz]

To the more mathematically inclined OpenEXR users and developers:

If you can spare the time, I would like you to read the attached
document and give me feedback on it.

The IlmImf library defines the file format for deep images and it
provides convenient methods for writing deep image files.  However,
the library and the existing documentation (as of September 2013)
do not explain in detail how deep images are meant to be interpreted.

The attached document attempts to describe what the deep data in a file
mean, and how compositing of deep images works.  The document also points
out numerical issues with the representation of volumetric samples, and
proposes an alternate volumetric sample representation that would address
those issues.

I believe that agreement on the interpretation of deep OpenEXR files
is desirable because it enables compatibility among different vendors'
image compositing applications.  In addition, anyone developing algorithms
such as lossy compression would be able to rely on a standardized
interpretation of a file's contents.

Florian

Deep Image Data 09-24-13.pdf
Description: Adobe PDF document