[Openexr-devel] OpenEXR 1.7 not backward compatible?

[Benoit Leveau]

Hi,

After re-compiling our renderman display driver with OpenEXR 1.7 libraries on 
linux 64bit, none of the images we generate
can be loaded into applications that link with older versions of OpenEXR (e.g. 
Nuke, in-house tools).

The error I get with our in-house player is:
OpenEXR input exception:: >> Cannot read image file "xxxxx.exr". The file format 
version number's flag field contains unrecognized flags. <<

I get the same exact error message in Nuke 6.0.

If I compare a file generated by 1.7 and 1.6.1 (or 1.4.0), the two files indeed 
differ, even in the first few bytes. It seems that the 1.7 libraries add new 
header flags,
and this is not safely ignored by old versions.

IMHO, if files generated by 1.7 can't be loaded by current versions of Nuke, 
that may greatly affect its widespread usage.

Thanks for your help,
Benoit