Glossary
Searchable terminology from accessibility, web standards, and related fields.
11 results found in image accessibility.
- Caption (Image Caption, Figure Caption)
- In the context of image accessibility, a caption is text that describes or provides context for an image. Unlike alt text, which is typically hidden and read only by screen readers, captions are often…
- Caption Crawler (Reverse Image Search Alt Text)
- A technique and tool that retrieves existing alternative text for web images by performing reverse image searches to find the same image on other websites where it has already been described. Rather t…
- Controlled Language (CL, Controlled Natural Language)
- A restricted subset of a natural language that limits vocabulary, grammar, and style to reduce ambiguity and improve clarity and consistency in writing. In accessibility, controlled language rules can…
- Diagram Accessibility (Accessible Diagrams, Scientific Diagram Accessibility)
- The practice of making visual diagrams — including scientific figures, flowcharts, organizational charts, and technical schematics — accessible to people with visual impairments, learning disabilities…
- ESP Game (Extra Sensory Perception Game)
- A human computation game, created by Luis von Ahn, in which two randomly paired online players are shown the same image and independently type words to describe it, earning points when their labels ma…
- Exif (Exchangeable Image File Format, EXIF)
- A standard metadata format embedded within image files (JPEG, TIFF, and others) that stores information about how an image was created, including camera model, date, GPS coordinates, and orientation. …
- Information Graphics (Infographics, Data Graphics, Statistical Graphics)
- Visual representations of data, information, or knowledge designed to present complex information quickly and clearly. Common types include bar charts, line graphs, pie charts, scatter plots, and more…
- Longdesc (Long Description, longdesc Attribute)
- An HTML attribute historically used to provide extended descriptions for images that require more detail than can fit in an alt attribute. The longdesc attribute contained a URL pointing to a separate…
- Natural Language Generation (NLG, Text Generation)
- A subfield of artificial intelligence and computational linguistics focused on automatically producing human-readable text from structured data or other non-linguistic representations. In accessibilit…
- Scalable Vector Graphics (SVG)
- An XML-based vector image format for two-dimensional graphics that supports interactivity and animation. Unlike bitmap formats (JPEG, PNG, GIF) which store images as grids of pixels, SVG describes sha…
- Text Alternative (Alt Text, Alternative Text, Text Equivalent)
- A textual replacement for non-text content, primarily images, that conveys the same purpose or information as the visual element. Text alternatives are essential for users who cannot perceive images, …