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Re: [Openexr-devel] OpenEXR version compatibility


From: Piotr Stanczyk
Subject: Re: [Openexr-devel] OpenEXR version compatibility
Date: Mon, 21 Mar 2005 19:35:40 +0000

this is mainly on rh72, though similar issues on fedora core 1. I've attached the offending file.

If we pass this through a tool that simply reads the data and writes it out again with a different compression scheme, linked against 1.0.5, the file is then consistent across all versions.

Can you replicate the errors at your end?

Thanks,

Piotr

Attachment: piz_errors.exr
Description: Binary data



On 21 Mar 2005, at 18:49, Drew Hess wrote:


We haven't seen that, nor has anybody else reported it.  Files written
by previous versions of OpenEXR should always be readable by later
versions (except for tiled files written by the development versions
1.1.0 and 1.1.1, those are unsupported because we changed the tiled
format before officially releasing it).

On what platform is this?  Can you send me one of the example images
that demonstrates the problem?

thanks
d



Piotr Stanczyk <address@hidden> writes:

Hi All,

We have recently been having more and more problems with reading
OpenExr files that have been generated with application linked against
1.0.5 and processing these files with applications linked against
1.2.1.
In particular, this is characterised by apparent pixel noise in the
bottom of the image and, so far, only occurs when used in conjunction
with the piz compression scheme.  Sometimes there are no errors
reported when reading these file, at other times messages relating to
the Huffman encoding crop up.
Am I correct in thinking that I should be safe in doing this? there is
a file version attribute but it has not changed across these versions.

Anyone had similar experiences of this?

Many thanks

Piotr

BTW  I managed to grab some some example images in the middle of our
pipeline that demonstrate this quite well.



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