Re: Cineframe 30/Cineframe 25 resolution loss vs. 60i

"However, viewing stills from a group of five frames, it looks like the lowest res is 425, and the highest res is 575. It looks like there are two frames of 425, two frames of 475, then one frame of 575 in each group of five."

If you look at my CF24 diagram, the first frame should have max V rez. Two of the frames should be judder frames with the content of two different fields -- the 475 frames.

And 2 that have simple interpolation -- the 425 frames.

OK -- THAT'S MY INTERPRETATION of your data. :)

Interesting that once again, the maximum rez is about 575 which I explain by Sony imposing a low-pass filter on ALL the CF modes to prevent line flicker and twitter when "progressive" is displayed on interlace TVs.

HOWEVER, are you inputing via firewire? If not, the filter could on analog output.

Makes the CF modes OK for interlace display. But damn near useless for film making when compared to the great results from software deinterlacers.

Remember that both CF25 and CF30 will have exactly the same EYE STROBING problem as 720p30. Why worry about that when you have the option of 50i and 60i?

And, Sanjin if 60i comes from NTSC then 50i comes from the old fashioned inability of Britsh AC generarors to crank out 60Hz. There is no excuse to be living with 50Hz flicker in the 21st Century.

Moreover, 100Hz Euro TVs suffer from the same eye strobing artifacts as does 720p30 in the JVC. Presenting the same frame twice is not a good way of raising the flicker fusion frequency. (One reason film projectors limit light output and yet you still see flicker in bright skys.) That's why computer monitors run at 85Hz to over 100Hz.



Steve Mullen
Digital Video Consulting
www.mindspring.com/~d-v-c
===
HDpartner Prime -- Real-time 1080i and 720p HDV Editing with FCP HD
GR-HD1 and JY-HD10 HDV Shooting Guide
AG-DVX100 Shooting Guide