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+--- Thread: Proof of Concept- Z Film Alteration (/thread-13074.html)
Proof of Concept- Z Film Alteration - Chris Davidson - 15-09-2014
David Josephs Wrote:So you can lead it wherever you 'd like, no?
And yes, I would LOVE to hear how the film in the Archives - all 6'3" of it - could have been originally filmed at 18.3 and exhibit the movement anomolies we see...
You do remember making a film for me at 48fps and cutting it down to 16fps (remove 2/3) and shown at 15fps...
It illustrates what we see in the extant Zfilm... and hides 2/3's of the activity... by cutting out 4 frames in a row one can remove quite a lot and still keep the 1st and last frames for continuity...
The film would appear to jump very slightly...
Do we see any slight jumps in the Z-film? of course we do. Especially during the headshot sequence...
DJ
Why don't you direct me to another topic and ask me about it there.
I explained that this topic will be short and sweet.
Put your frame rate questions on hold for a second and tell me you understand the 2 gifs I have provided.
chris
Proof of Concept- Z Film Alteration - Chris Davidson - 15-09-2014
Compare my video to Zframes 280-281.
The bottom edge/part of the background structure in Z appears as a ghost image one frame before it hits the top sprocket hole.
They agree.
chris
Proof of Concept- Z Film Alteration - Chris Davidson - 15-09-2014
If you understand the comparison between my film and Z280-281, you should have no problems figuring out what is wrong (Zfilm wise) with this last and final gif.
The film is running at approx 18fps within the photo. Remember, keep the panning speed of my gif (also approx 18fps) in mind when comparing
This is all about GHOST IMAGES, nothing else.
It helps to know what the background structure looked like when added to the extant Zfilm.
chris
Proof of Concept- Z Film Alteration - David Josephs - 15-09-2014
Chris Davidson Wrote:Chris Davidson Wrote:Step one:
I shot this footage back in 2005 from the pedestal with a B/H 414 on full zoom.
Stabilized it.
Important Aspects: 1. The ghost image over the lower sprocket hole
2. Panning Speed
chris
Observe the relationship of the building edge at the top of the main frame leading into the upper sprocket hole tothe building edge from the ghost image (over the lower sprocket hole).The building edge at the top of the main frame leading into the upper sprocket hole trails the building edge from the ghost image (over the lower sprocket hole) by 1 frame.
This is the only concept you need to understand.
chris
Always enjoy how cryptic you remain Chris... You say things without actually saying them...
Yes, the ghost image is actually the extended TOP of the previous frame..
Which is why the film MUST have been refilmed onto the extant film at some point, otherwise these images would not match...
The instantaneous cut from one frame to the next, when Z supposedly stopped filming, would be exposed if it had not been refilmed.
If this had been a straight stop and start. From z132 (last frame before limo-blurry) the ghost image on 133 SHOULD be identical to the image under the top sprocket hole in 132 since it was already exposed as a ghost when 132 was filmed. The spill-over at the top left of 133 under the sprocket, if from a previous frame, should NOT show vehicles making the turn.
This spliced transition, along with the corroborating testimony proves that Zapruder did not stop filming once the motorcade arrived and DID film the wide turn as discussed by Truly.
I believe the 48fps filming started with this transition and is why this portion of the film was not "refilmed" to correct the ghost image problem)
Proof of Concept- Z Film Alteration - David Josephs - 15-09-2014
Chris Davidson Wrote:If you understand the comparison between my film and Z280-281, you should have no problems figuring out what is wrong (Zfilm wise) with this last and final gif.
The film is running at approx 18fps within the photo. Remember, keep the panning speed of my gif (also approx 18fps) in mind when comparing
This is all about GHOST IMAGES, nothing else.
It helps to know what the background structure looked like when added to the extant Zfilm.
chris
Since you "have no problems figuring out what is wrong" - can you state it simply?
Between you and Purvis all we seem to get are suggestions rather than analytical conclusions...
The ghost images is the width of the sprocket holes, NOT the darker vs lighter areas.. The sprocket hole ghosts areas remain lighter than the other areas...
What EXACTLY are you saying?
Proof of Concept- Z Film Alteration - Chris Davidson - 15-09-2014
David,
The structure in the background (280-307) has openings which are quite noticeable. It is a continuous structure.
The ghost images we see during this span are delayed at least/approx 10 frames from when they should appear.
chris
Proof of Concept- Z Film Alteration - Chris Davidson - 15-09-2014
The numbers in the ghost image area would correspond to the structure opening numbers if the film was correct.
Use the right side of the Zfilm upper sprocket hole as your guide.
chris
Proof of Concept- Z Film Alteration - David Josephs - 15-09-2014
Ok, I get you...
Aren't these columns and the rest of that part of that structure curving away from the camera position.
As the object is farther away the distance increases under the same panning motions...
Could it not simply be the change in distance and being unaware of the rate of panning?
DJ
Proof of Concept- Z Film Alteration - Chris Davidson - 15-09-2014
Start at ghost image frame 296 and count the number of openings moving to your right. I count 5.
The last one runs into Jean Hill. Those last three openings as ghost images are approx the same width.
You can't get that size ghost image opening from the last 2-3 openings (right to left 7,8,9) because of the camera angle. #9 is pretty much closed.
Also, on the back side of this structure, at an angle to the Z pedestal, looking through #6 opening, there is a solid white pedestal that rises above the #6 opening.
This does not appear in any ghost image among those openings.
chris
P.S. I believe that is the pedestal Bell was filming from.
Proof of Concept- Z Film Alteration - Drew Phipps - 17-09-2014
Chris: I'd like to ask you a huge favor. Could you please post or send me every third frame of your short film (since you filmed at 48 fps)? I'd like to compare your film with my pixel counting work on the Z film and see if I find the same anomalies as I found there.
If I find the same anomalies, its more likely my methodology or some intrinsic camera error. If I don't find the same anomalies, its more likely the Z film was altered. Thanking you in advance for your assistance!