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[Openexr-devel] bug in DWAA and DWAB compression schemes?


From: Mike Day
Subject: [Openexr-devel] bug in DWAA and DWAB compression schemes?
Date: Fri, 29 Mar 2019 08:16:02 -0700

Hi,

when an exr is written using either the DWAA or the DWAB compression scheme, with a 3-channel image at least, any channel value over approx 2^16 seems to get output as 0. I wondered if this behaviour was intentional, or if it would make more sense to clamp it to the max representable value.

Even clamping wouldn't be ideal, so would it make even more sense to have a global multiplier to allow arbitrarily high output values (at the expense of degrading the quality of the smaller values)?

Thanks,
Mike Day


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