Frame rate, spatial resolution, and screen size are three interrelated factors, but there are many more, including viewing distance, shutter angle (or duty cycle), and panning speed/scene motion.
We have had about 88 years of experience of people watching movies shot and projected at a 24-fps rate (and generally seen with a dual image flash having a 50% duty cycle), yet audiences have not run screaming from cinemas thanks to the craft of cinematographers who long ago figured out practices to deal with these issues, some of which are listed in the panning-speed/shutter-angle tables of the American Cinematographer Handbook and others of which might be considered, perhaps. tradition.
It is common, for example, for a scene in a restaurant to begin with what I call a "waiter shot." The camera follows a moving waiter who is otherwise unrelated to the plot to the table where the important characters sit. The camera motion makes the waiter relatively stationary on the screen, and the audience focuses on that moving person, rendering the strobing of the background relatively invisible.
TTFN, Mark On 6/5/2013 12:36 AM, Mark Aitken wrote:
Sorry, I did not get the right words out...What size do the images need to be to drive the higher frame rates? Do 7 680 x 4 320 and 3 840 x 2 160 (16:9) moving pictures need 120 or 240 or some other 'big' Hz rate if the images are only 40"? What about 120"? 240"? What are the interrelated dynamics at work? Mark -----Original Message----- From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On Behalf Of Cliff Benham Sent: Tuesday, June 04, 2013 11:22 PM To: opendtv@xxxxxxxxxxxxx Subject: [opendtv] Re: Ultra HD broadcasts demand higher frame rates The high quality formats Craig listed in the post I commented on. Cliff On 6/4/2013 2:22 PM, Mark Aitken wrote:----------------------------------------------------------------------Define high quality. The primary gating factor driving for higher frame-rates is 'immersion'. Big, clear pictures require it. But, I will ask again, what is your definition of high quality...important metric that must be defined. Mark -----Original Message----- From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On Behalf Of Cliff Benham Sent: Tuesday, June 04, 2013 1:26 PM To: opendtv@xxxxxxxxxxxxx Subject: [opendtv] Re: Ultra HD broadcasts demand higher frame rates On 6/4/2013 12:11 PM, Craig Birkmaier wrote:I was hoping this story might stimulate some discussions; guess I'll have to start them...Over 10 years ago on this list, I stated that 300FPS is the rate necessary for high quality images. That comment went totally ignored. Cliff ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line. ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.----------------------------------------------------------------------You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.
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