It is frequently used on news programs to display weather graphics behind talent and for visual effects compositing. Chromakey:Ĭhromakey is a method of creating transparency in a video source by selecting a specific “key color” to create an alpha matte. Red, green, and blue channels make up RGB images, with an optional alpha channel for transparency. Channel:Ī channel is one of several grayscale components used to make up a color image. If the source video is analog, the capture process converts the video to digital. The process of transferring source video from a camcorder or tape deck to a computer. The process of making all blue elements in an image transparent and placing a different background underneath. See also blue screen compositing and green screen. Blue Screen:Ī blue screen is a blue background that the subject stands in front of that the computer later replaces with another background in post-production. The bitrate, in Kilobits per second, can be variable or constant. For every second in the video, the Bit Rate, or Data Rate, is the amount of data used each second. The frequency at which bits (binary digits) pass a given physical or metaphorical point, measured in bps (bits per second). The higher the number, the better the sound quality. Similarly, in digital audio, bit depth indicates the number of bits per sample. 24-bit color allows for displays of millions of colors. As bit depth increases, more colors become available. A high-contrast (no gray tones) black and white image is 1bit, meaning it can be off or on, black or white. In digital graphics and video, bit depth indicates the number of colors an image can display. A BIT can be either a 1 (one) or a 0 (zero). Common examples include the footage used to cut away from an interview or news report to help tell the story. B- B-roll:ī-roll is supplemental footage that provides supporting details and greater flexibility when editing video. A rate of 44,100 samples per second produces CD-quality audio and captures the range of human hearing. The higher the sample rate, the higher the quality of the digital audio. The number of samples taken per second to reproduce audio digitally. The standard covers both standard and high-definition formats. ATSC:ĪTSC is a digital broadcast standard that replaced the older analog NTSC standard. The most common aspect ratios for motion pictures are 1.85:1 and 2.35:1. The standard ratios for NTSC SD videos are 4:3 (or 1.33:1) and HD 16:9 (or 1.77:1). The ratio of width to height in a flat surface or 2-dimensional abstract construction, such as an image, video, character, or pixel. Artifact:Īn artifact is undesired data in an image because of digital processing. Anti-aliasing can also mean a method of filtering out erroneous frequencies in an audio signal. Anti-Aliasing:Īnti-aliasing is a process for smoothing jagged lines in an image. The technique of making inanimate objects or drawings appear to move in motion pictures or computer graphics. Ambient Noise:Īmbient noise is background noise specific to the shooting location. Alpha Channel:Īn alpha channel is a channel in an image or movie clip that controls the opacity region. The value of alpha in the color code ranges from 0.0 to 1.0, where 0.0 represents a fully transparent color, and 1.0 represents a fully opaque color. Alpha:Īlpha blending is a convex combination of two colors allowing for transparency effects in computer graphics. The undesirable jagged or stair-stepped appearance of angled lines in an image, graphic, or text. The Principal video that is usually someone speaking. Please let us know if you need a term defined by These definitions are a work-in-progress. Becoming familiar with these terms only makes your job easier. Here is a list of terms commonly found in videoĮditing. Like most industries, video production hasĪ language all its own. If you find yourself wondering what a video production term or an acronym There is much technical terminology in today’s fast-moving media-centric world.
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