Re: [Openexr-devel] EXR file killing windows library

[Florian Kainz]

Hi Charles,

you may want to try using a newer version of the OpenEXR
libraries.  Drew will officially release  1.0.7 as soon
as Savannah works again.

Because the PIZ-compressed form of the single black pixel 
is longer than the original data, the pixel is stored in 
the file in uncompressed form.  The PIZ compressor adds 
a header to the compressed data; the size of this header 
offsets any gains you might get from compressing the 
6-byte input.

In recent months, Wojciech Jarosz fixed a couple of bugs 
that were related to uncompressable data.  In some cases
the library would try to uncompress data that were not
compressed.  I have a version of exrdisplay, which I 
compiled on 07/16/03 (before Wojciech's fixes, which 
were checked into the ILM-internal code base on 08/15/03), 
and it fails to read your test file.  Recently compiled 
versions of exrdisplay read the test file correctly.

Florian


Charles Henrich wrote:
> 
> I have this exr file I've generated which reads fine in Linux, but apparently
> causes the windows libraries to dump.  Its a single black pixel image with the
> data window sized appropriately.
> 
> test.exr:
> 
> file format version: 2
> channels (type chlist):
>     B, 16-bit floating-point, sampling 1 1
>     G, 16-bit floating-point, sampling 1 1
>     R, 16-bit floating-point, sampling 1 1
> compression (type compression): piz
> dataWindow (type box2i): (0 389) - (0 389)
> displayWindow (type box2i): (0 0) - (719 389)
> lineOrder (type lineOrder): increasing y
> pixelAspectRatio (type float): 1
> screenWindowCenter (type v2f): (0 0)
> screenWindowWidth (type float): 1
> 
> File at
> 
> http://www.sigbus.com/~henrich/test.exr
> 
> Thanks!
> 
>        Charles Henrich           Digital Domain          address@hidden
> 
>                          http://www.sigbus.com/~henrich
> 
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