Re: [Openexr-user] openEXR-backplates

[Brendan Bolles]

On Apr 1, 2004, at 1:07 AM, address@hidden wrote:

> on the openEXR-website they say that they use the openEXL-format for 
> 2k or
> hd scans of filmed sequences.
>
> How do they get the high dynamic range when scanning? Do they scan the
> sequences multiple times with different "exposure"-settings?
> Normal filmscanners output 10 bit logarithmic cineon files - is the 10 
> bit
> log colordepth enough to generate openEXR-files?


In 10-bit log space (values 0-1023), 95 is usually considered black and 
685 white.  So there is a considerable amount left over to represent 
values over white, which film scanners have been capturing for a while.

I think that definition of 0-1 is based on a monitor's dynamic range, 
which film exceeds.

But does this mean that ILM and possibly others are scanning directly 
to EXR and never going through 10-bit Cineon?  Drool.


Brendan