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Raster: meaning, definitions and examples

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raster

 

[ˈrΓ¦stΙ™r ]

Definitions

Context #1 | Noun

geospatial data

A raster is a grid-based data structure comprised of cells or pixels, with each cell containing a value representing information, such as temperature or elevation, for that location. Rasters are used in geographic information systems (GIS) to represent continuous data and are essential for tasks such as land use mapping and environmental monitoring.

Synonyms

grid, image, map.

Examples of usage

  • The satellite image is represented as a raster.
  • We analyzed the raster data to assess land cover changes.
  • The GIS tool requires a raster file for terrain analysis.
Context #2 | Verb

graphics manipulation

To rasterize is to convert a vector image or graphic into a raster image format composed of pixels. This process is essential for displaying graphics on screens or for printing, as raster images are made up of tiny dots that ensure they appear correctly on display devices.

Synonyms

bitmap, pixelate, render.

Examples of usage

  • We need to rasterize the logo for the web.
  • The designer rasterized the illustrations before printing.
  • Rasterizing the artwork improved the rendering speed.

Interesting Facts

Etymology

  • The word 'raster' comes from the Latin word 'rastrum', which means 'to scrape' or 'to scratch'.
  • It was first used in the context of scanning images in the 1960s, referring to how images were drawn line by line.
  • The term has evolved to relate to grid-based images, distinguishing them from vector graphics.

Technology

  • Raster graphics are used in a variety of applications, including digital photography, video games, and web design.
  • Most digital screens, like TVs and computers, display images through a grid of raster pixels.
  • Raster images lose quality when resized because they are pixel-based rather than formula-based.

Art

  • In art, raster images can create photorealistic designs, showing detailed textures and colors.
  • Graphic design software like Adobe Photoshop primarily works with raster images to allow detailed editing and manipulation.
  • Art forms like pixel art are built on raster graphics, celebrating the small bits of color that form larger images.

Science

  • In scientific imaging, raster methods are used in fields like astronomy to map star fields and analyze cosmic phenomena.
  • Medical imaging techniques, like MRI and CT scans, create raster images to represent detailed structures within the body.
  • Geographic Information Systems (GIS) often use raster data to visualize terrain and other spatial information.

Computer Graphics

  • Rasterization is the process of converting shapes into pixels, a crucial step in rendering images in computer graphics.
  • Advancements in display technology have improved raster image quality, allowing for higher resolutions and more vibrant colors.
  • Rasterization techniques are essential for modern gaming graphics, where realistic images enhance the user's experience.

Word Frequency Rank

Positioned at #23,175, this word is part of extensive vocabulary. It's relatively rare in general usage but may be important in specific fields or formal writing.