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Ghosting on green screened PTC - how to fix?

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Sarah Bright
Ghosting on green screened PTC - how to fix?
on Nov 22, 2012 at 11:40:54 am

Hi guys,
I've got a PTC with old black and white archive footage underneath.

As the guy bends down to get something and then moves out of shot, there is a slight ghosting of his movements.

Is there anyway the reduce it/ remove it completely?

This footage isn't sped up or slowed down either.


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Dave LaRonde
Re: Ghosting on green screened PTC - how to fix?
on Nov 23, 2012 at 5:10:58 pm

Please tell us about the media container and codec of the green screen footage, or at the very least the type of camera used to shoot it and any intermediate transcoding that may have occurred.

The quality of any chroma key depends on good lighting, a codec that records the color scanned by the camera in sufficient resolution, and the type of keyer being used. You can tell us about the codec and the keyer, but we'd need a screen shot of a frame from the original footage to comment on lighting.

Incidentally, this is the first time I've heard the term "PTC". So I looked it up on Wikipedia, I found the following text in italics, and I'm not sure which applies in your case:

PTC may refer to:
In education:
Pilot Training College, a JAR Flight Training Organisation fully approved for commercial pilot training
Police Training Centre, Bangladeshi academies to impart training mainly to Trainee Recruit Constables of Bangladesh Police
Portage Trail Conference, an association of public schools within the northeastern Ohio counties of Portage, Summit, and Stark
Presbyterian Theological Centre, a theological college of the Presbyterian Church of Australia
Presbyterian Theological College, the theological college of the Presbyterian Church of Victoria
Princeton Tower Club, one of the ten eating clubs at Princeton University
Princeton Triangle Club, a theater troupe at Princeton University
RAF Personnel and Training Command, an obsolete command of the Royal Air Force
In organizations:
Pakistan Telecommunication Company Ltd, the largest telecommunication company in Pakistan
Pakistan Tobacco Company, a cigarette company in Pakistan
Parametric Technology Corporation, a Massachusetts software company
Parents Television Council, a U.S. based advocacy group
Party of Labour of Catalonia (Partit del Treball de Catalunya), a communist party in Catalonia, Spain
Pennsylvania Turnpike Commission, a transportation agency created to construct, finance, operate and maintain the Pennsylvania Turnpike
Philadelphia Toboggan Company, the oldest existing roller coaster manufacturing company in the world
Philadelphia Transit Company, a private company acquired by SEPTA in 1968
Pilot Travel Centers, a brand of the Pilot Flying J chain of North American truck stops
Pioneer Theatre Company, one of four fully professional theatre companies in Utah
Polska Telefonia Cyfrowa, a Polish mobile phone network operator whose main brand is T-Mobile
PTC Punjabi, a popular Punjabi television network from India
PTC Punjabi (Canada), a Canadian category 2 Punjabi language digital cable specialty channel
Public Services, Tax and Commerce Union, a short-lived trade union in the United Kingdom
Public Transport Corporation, a state-owned corporate body that operated passenger and freight trains, trams and bus services in Victoria, Australia
Radio Television of Serbia (Радио-телевизија Србије), the public broadcaster in Serbia
In science:
papillary thyroid cancer, the most common type of thyroid cancer
Echinopsis peruviana (Peruvian Torch Cactus), a fast-growing columnar cactus native to the western slope of the Andes in Peru
Idiopathic intracranial hypertension (also pseudotumor cerebri), a neurological disorder characterized by increased intracranial pressure in the absence of a tumor or other diseases
Percutaneous transhepatic cholangiography, a radiologic technique used to visualize the anatomy of the biliary tract
Phase-transfer catalyst, a catalyst that facilitates the migration of a reactant from one phase into another phase where reaction occurs
Phenylthiocarbamide, an organosulfur thiourea containing a phenyl ring
Plant tissue culture, a practice used to propagate plants under sterile conditions
Positive temperature coefficient, materials that experience an increase in electrical resistance when their temperature is raised
Premature termination codon, a nucleotide triplet within messenger RNA that signals a termination of translation
Patched, a transmembrane protein receptor involved in the Hedgehog signaling pathway
The Photon Transfer Curve in CCDs
Paid To Click, an online business model where a consumer is paid to view an advertisement
Pass-Through Certificates, instruments that evidence the ownership of two or more Equipment Trust Certificates
Peachtree City, Georgia, a city in Fayette County, Georgia, United States
Piece to camera, a television and film term used for when a presenter or a character speaks directly to the viewing audience through the camera.
Players Tour Championship, a series of minor-ranking snooker tournaments
Positive train control, a system of monitoring and controlling train movements to provide increased safety
Production Tax Credit, a type of tax credit or sum deducted from the total amount a taxpayer owes to the state

Dave LaRonde
Former Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA

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