Glossary

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Caption Customization(also: Caption Personalization, Adaptive Captioning)

The ability for viewers to adjust caption properties to match their individual preferences and needs. Caption customization can encompass visual attributes like font size, color, and positioning, as well as content-level attributes like level of detail, expressiveness, and sound…

Caption Density

The amount of caption text displayed on screen relative to the available display time and screen space. High caption density—common in fast-paced scenes with many sound events—can overwhelm viewers by requiring rapid reading while also attending to visual content. Caption…

Caption Occlusion(also: Caption Blocking, Subtitle Occlusion)

The phenomenon where captions or subtitles visually block or cover other important information displayed on a video screen. Caption occlusion is a significant accessibility concern for Deaf and Hard of Hearing viewers, who depend on captions for dialogue access but may…

Caption Placement(also: Caption Positioning, Subtitle Placement)

The decision of where captions or subtitles are positioned on a video screen, which significantly affects the viewing experience of Deaf and Hard of Hearing users. Poor caption placement can occlude important visual information such as speakers' faces, onscreen graphics, or news…

Caption Readability

The ease with which viewers can read and process caption text on screen, influenced by factors including font size, display duration, caption density, reading speed requirements, and competition with on-screen visual content. Caption readability is a core accessibility concern…

Captioning Key(also: DCMP Captioning Key)

A set of guidelines and best practices for creating high-quality captions, most notably published by the Described and Captioned Media Program (DCMP). The Captioning Key covers standards for caption accuracy, consistency, placement, and the representation of non-speech sounds.…

Chroma Key(also: Green Screen, Blue Screen, Chroma Keying)

A video-post-production technique in which a solid, uniformly coloured background (often green or blue) is replaced with another image, video, or transparency using colour-matching software. In accessibility work, chroma key is most often encountered in the production of…

Closed Captioning(also: CC, Closed Captions)

Text displayed on screen that represents dialogue, sound effects, music, and other audio information in video content, which viewers can toggle on or off. Unlike open captions, closed captions are a separate data stream that can be enabled or disabled by the viewer. Closed…

Closed Captioning(also: CC, Closed Captions)

Text displayed on a screen that transcribes spoken dialogue, identifies speakers, and describes relevant sound effects in video content. Unlike open captions which are permanently embedded in the video, closed captions can be toggled on or off by the viewer. Closed captioning is…

Community Sourcing(also: Community-Driven Accessibility)

An approach to creating accessible content by drawing on community members who have domain expertise or vested interest in the content, rather than relying on professional describers or general crowdworkers. Unlike crowdsourcing, which draws from a broad pool of workers who may…

Comprehensibility(also: Comprehension, Intelligibility)

The degree to which users can understand and retain the key elements of content, including events, characters, actions, settings, and narrative progression. In audio-described media for visually impaired users, comprehensibility measures how effectively the audio presentation…

Content Creation Accessibility(also: Accessible Content Creation, Creator Accessibility)

The design and provision of tools, platforms, and workflows that enable people with disabilities to create digital content such as videos, images, audio, and text. Unlike content accessibility, which focuses on making finished content consumable by people with disabilities,…

Content Domestication(also: Media Domestication)

The process of translating or adapting media content to meet the specific needs of a target audience during production rather than through post-hoc modifications. Originating from media studies and audiovisual translation, content domestication in accessibility involves…

Customizable Captioning(also: Personalized Captions, Adaptive Captioning)

Captioning systems that allow users to modify how captions are displayed, including visual styling, content detail, and the representation of paralinguistic speech features such as emotion, loudness, and pitch. Unlike standard closed captions that offer only basic font and size…

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