JFK Assassination Plus General Discussion & Debate > JFK Assassination Plus General Discussion And Debate
How long does it take to alter hundreds of frames of film?
Chris Davidson:
Close to the 154-158 span
CE884 entries for Z161-z166
Using the lightpost and CRB corner from the extant Z background, plotting the limo via the WC final plat, the speed of the limo equals 13.44mph.
13.44 x 1.47(1mph) = 19.7568 ft per sec
19.7568 / 18.3fps = 1.0796 ft per frame
5 frames (z161-z166) x 1.0796 ft per frame = 5.4ft traveled
CE884 states .9ft traveled for 5 frames
6frames x .9ft (distance given for 5 frames traveled CE884) =5.4ft
CE884 distance reflects 1 frame traveled at .9ft with the distance of 5 frames traveling @ 13.44mph, missing.
Chris Davidson:
Limo Speed from CE884 Z161-z166:
18.3frames/5frames = 3.66 x .9ft = 3.294ft per sec / 1.47 = 2.24 mph
13.44mph - 2.24mph = 11.2 mph = Shaneyfelt
Mr. SPECTER. Is that a constant average speed or does that speed reflect any variations in the movement of the car?
Mr. SHANEYFELT. That is the overall average from 161 to 313. It does not mean that it was traveling constantly at 11.2, because it was more than likely going faster in some areas and slightly slower in some areas. It is only an average speed over the entire run.
John Iacoletti:
--- Quote from: Jack Trojan on January 09, 2018, 08:01:27 PM ---
--- Quote from: Joe Elliott on January 09, 2018, 04:04:22 AM ---Jack does not understand simple Physics.
--- End quote ---
I'm a physicist. ;D
--- End quote ---
Chris Davidson:
--- Quote from: Chris Davidson on January 09, 2018, 09:09:20 PM ---Limo Speed from CE884 Z161-z166:
18.3frames/5frames = 3.66 x .9ft = 3.294ft per sec / 1.47 = 2.24 mph
13.44mph - 2.24mph = 11.2 mph = Shaneyfelt
Mr. SPECTER. Is that a constant average speed or does that speed reflect any variations in the movement of the car?
Mr. SHANEYFELT. That is the overall average from 161 to 313. It does not mean that it was traveling constantly at 11.2, because it was more than likely going faster in some areas and slightly slower in some areas. It is only an average speed over the entire run.
--- End quote ---
One other confirmation is Myers multi film sync project.
Once again, when plotted the limo travels 12.03 mph from z149-161 and 13.44mph from z161-z172.
The average between those two equals 12.735mph.
Myers has it traveling 10.5 mph between z150and z175.
The difference being 12.735mph - 10.5 mph = 2.235mph equals the previous difference (2.24mph) listed.
Myers 25 frame span = 25/18.3 = 1.366.... sec
1.366...sec x 3.294ft per sec(2.24mph) = 4.5ft = 5frames at .9ft per frame
So 5 frames @ 13.44mph = 6 frames @ 11.2mph in terms of distance.
And, .9ft per frame = 11.2mph @ 18.3Frames per sec.
John Mytton:
--- Quote from: Jack Trojan on January 09, 2018, 01:16:46 AM ---I already replied to this thread but it got wiped out by the LNers because I was getting too close to home. ;D
Chris Davidson is on the right track. There are only 2 questions needed to be answered to resolve this one:
1) Where is the "original" Z-film? Life got a COPY.
2) Why was the film "edited"?
There were at least 2 splices in the film, which the FBI must have created and they removed an entire section of the turn onto Elm. Zapruder said he never recalled letting his finger off the trigger at any time after he started filming. So why was this footage removed? And why are there splices in the film? And most importantly, where is the original film and why did the FBI keep it?
Any editing done to the film to remove contradictions to the LN scenario would have been done with an optical printer like they used for practically all movies at the time for FX. This would include:
1) Speeding the limo up by removing frames before and after the head shot. Easy peasy.
2) Blackening the back of JFK's head for a few dozen frames. Piece of cake.
3) Cut out the turn onto Elm where the limo barely navigated the turn. Just another splice, which they botched.
So to ans the OP of how long does it take to alter hundreds of frames of film is...a few hours max. Which is exactly what they did. Otherwise, why did they modify it at all?
--- End quote ---
--- Quote ---I already replied to this thread but it got wiped out by the LNers because I was getting too close to home.
--- End quote ---
This is what I was talking about, delusions of self grandeur are rife in your community.
--- Quote ---Any editing done to the film to remove contradictions to the LN scenario would have been done with an optical printer like they used for practically all movies at the time for FX.
--- End quote ---
This was explained to you in the other thread, as soon as images are combined in an optical printer you have a degraded image with additional layers of grain. The special effects in movies at the time were locked off matte shots or blue screen work and not suitable for Zapruder type alterations.
The following two frames were filmed directly on set but the robots fighting picture was processed with multiple passes through an optical printer for added special effects like lasers and starfields which creates a much softer grainier image whereas the Zapruder film was just exposed once on the correct film stock.
The Zapruder frames reveal no build up of Film grain and thus the film was exposed in Zapruder's camera.
--- Quote ---1) Speeding the limo up by removing frames before and after the head shot. Easy peasy.
--- End quote ---
As soon as even one frame is removed you introduce an obvious stutter but throughout the Zapruder film is silky smooth. In the following gif only one frame was removed and the resulting lack of fluidity is plain to see.
--- Quote ---2) Blackening the back of JFK's head for a few dozen frames. Piece of cake.
--- End quote ---
You do realize that blackening one frame requires the exact correct pigment of black to match the surrounding level of black and then when you start a series of frames then you have to consider how your black is affected by the movement and constantly changing lightsource that have a direct effect on your black, so in other words without advanced computer cycles to calculate the various intensities of black you're not going to provide anything close to photorealistic.
--- Quote ---3) Cut out the turn onto Elm where the limo barely navigated the turn. Just another splice, which they botched.
--- End quote ---
Or maybe because an 8mm camera only takes a limited amount of film and Zapruder had already used some of the film so was simply saving film for Kennedy.
JohnM
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