[Openexr-devel] Deep object ID and lack of Z

[Larry Gritz]

The OpenEXR tech documents make it fairly clear that deep OpenEXR files must 
contain a "Z" channel in the base layer.

Some people have talked about OpenEXR deep files as a container for object IDs 
(stored as int32) that allows for a differing number of object ID values per 
pixel. Ideally, there would be only one channel, "id", of type int32. There is 
no need for (or meaning of) depth for this use case, but technically this would 
not be a valid OpenEXR file.

Thoughts? Is anybody else in favor of relaxing the hard requirement for Z 
channels, at least for the special case of other channels containing only 
integer values?


--
Larry Gritz
address@hidden