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A B C D E F G H I [J] K L M N O P Q R S T U V W X Y Z

J

Java.
A programming language that supports the creation of distributing programs, called applets.
Jitter.
Quick fluctuations in some aspect of a signal such as amplitude or frequency resulting in a signal that is not stable and an output (video image or audio sound) that is not stable.
Jitter Reduction.
Means for reducing jitter (rapid fluctuations of some aspect of a signal resulting in degraded performance).
Jog.
To move a video tape forward or back a very short distance (one or two frames) in search for the "perfect" place to edit.
Jog/Shuttle.
A round dial found mainly on some VCRs and DVD players which allows the easy movement forward or backward within a software program (usually a movie).
Joule.
A single unit of electrical energy equal to the energy expelled by passing one ampere of current through a one-ohm circuit (ohms measuring impedance or resistance to electric current) for one second.
JPEG (Joint Photographic Experts Group).
JPEG is a digital compression standard for still video images that allows the image to occupy less memory or disk space. Like the MPEG standard, it includes options for trading off between storage space and image quality.
Uses transform encoding
24-bit format allows -16.7 million colours
Good for photorealistic, full colour scenes; bad for simple scenes containing hard lines and edges.
JPG, JPEG: Joint Photographic Expert Group, is a good format for photographs because JPEG files can contain millions of colors.
JPEG images don't give you the option of including transparency or of interlacing images, but they do allow you to specify the degree of file compression so that you can create a balance between image quality and file size.
A new addition to the JPEG format is Progressive JPEG. Pro-JPEGs boast superior compression to regular JPEGs. They also give you a wider range of quality settings. Pro-JPEGs also support interlacing.
Jukebox Changer.
Term used to describe a CD changer that holds a large number of discs (often 50 or more) and can easily switch from one disc to another and play all the discs held within.
Jump cut.
An edit from one scene to a very similar scene, causing the picture to "jump" from one position to another. Such edits should be hidden by video inserts of related scenes (cutaways).
Jumper
Used to connect multiple speaker binding posts on speakers capable of bi- or tri-amping.
Juxtaposition.
Editing together opposites, like opposing views or conflicting responses to a question