Re: [Openexr-devel] Re: [Openexr] KeyKode offsets

[Daniel A. Fort]

Hi Florian,

>     A) DPX-style film edge codes, as listed in section 6.1 of SMPTE 268M,
>        "File Format for Digital Moving-Picture Exchange":

SMPTE 268M? Just ordered it ($30) so I can try to understand this one. I
would think that this would be the best choice for OpenEXR.
>     B) "Film feet edge numbers" as specified by SMPTE RP 195, "Use of the
>        Reference Mark in Manufacturer-Printed Latent Image Key Numbers
>        for Unambiguous Film Frame Identification".  This numbering
>        scheme covers 35mm and 65mm film with key numbers occuring every
>        64, 80 and 120 perforations, and with 3, 4, 8 and 15-perforation
>        frames. (If you are voting for this one, please explain to me how
>        the scheme works.  After reading RP 195, I still don't understand
>        it.)
This is the way I was taught to identify film frames. After reading the
document I would say that this is what all negative cutters, film
assistants, telecine operators, etc. understand.
These resources will help illustrate SMPTE RP 195:

http://www.kodak.com/US/en/motion/products/keykode/diagrams.shtml
http://www.davsys.com/PDF/flex1007.pdf
http://www.evertz.com/resources/3perf.pdf

Note: Sorry if this message went out twice--seems like I hit the wrong
button when saving the draft.
--Dan