Re: [Openexr-devel] does half round-trip?

[Ken McGaugh]

I wrote a small program a while back to test this and it did
round-trip without any loss.  For every 10-bit code value there
was exactly one 16-bit half.  But in shake you have the extra
step of going through 32-bit float which may introduce some
rounding errors.

Paul Miller wrote:
> I'm working on an updated Cineon I/O module, and when I use 16 bit int, 
> with the Cineon log data stretched to 0-65535, I can round-trip exactly.
>
> However, when I use half as an intermediate format with the cineon 
> linearized between 0->1 (keeping super blacks and super whites), it does 
> not seem to be round-tripping. It's close, and not noticable visually, 
> but Shake's Common node is showing tons of "noise".
>
> Is this expected?