A scanning pattern of parallel lines that form the display of an image projected on a cathode-ray tube of a television set or display screen
A raster, sometimes also called a "scan line," is a single row of pixel information in a digital image A "raster image" is an image made of such rows
A row of elements, such as pixels on a video monitor Multiple raster lines comprise the matrix of pixels that form a complete image Related terms: digitizer (video), grid systems
{i} rectangular area of scan lines onto which a beam of electrons is directed to create a visual image (in television screens and computer monitors)
A raster image is a matrix of row and column data points whose values represent energy being reflected or emitted from the object being viewed These values, or pixels, can be viewed on a display monitor as a black and white or color image
The series of lines of information, such as the parallel horizontal scan lines that form a television or vide display image
Raster images are made of an array of either 2-D or 3-D information Image data is usually stored in a bitmapped form and sometimes these files are called bitmapped files Examples of raster image files are TIFF, GIF and JPEG
A pattern of scanning for input or output, which provides uniform coverage of a two-dimensional surface, such as a monitor screen, a scanner bed, or the CCD array in a digital camera
displays and databases build all geographic features from grid cells in a matrix A raster display builds an image from pixels, pels, or elements of coarse or fine resolution A raster database maintains a similar "picture" of reality in which each cell records some sort of information averaged over the cell's area The size of the cell may again be coarse or fine, ranging from centimeters to kilometers Many satellites, like Landsat and SPOT, transmit raster images of the earth's surface Reflectance at a certain wavelength is measured for each cell in an image The cells may cover areas on the earth's surface several hundreds of meters square, the area covered being a function of a particular satellite's resolution
Raster images are made up of individual dots; each of which have a defined value that precisely identifies its specific color, size and place within the image (Also known as bitmapped images )
A cellular data structure composed of rows and columns for storing images Groups of cells with the same value represent features Raster data is an abstraction of the real world where spatial data is expressed as a matrix of cells or pixels, with spatial position implicit in the ordering of the pixels With the raster data model, spatial data is not continuous but divided into discrete units This makes raster data particularly suitable for certain types of spatial operations,such as overlays or area calculations Unlike vector data, however, there are no implicit topological relationships
A pattern of horizontal lines displayed on a computer or TV monitor As the part of a monitor s screen that is actually being used to display images, it s a bit smaller than the physical dimensions of the display screen itself It varies for different resolutions Most monitors have controls that allow you to move or resize the raster
The process of rendering an image or page, pixel by pixel, in a sweeping horizontal motion, one line after another
A predetermined pattern of scanning lines within a display space Note: An example of a raster is the pattern followed by an electron beam scanning the screen of a television camera or receiver (188)
The process of rendering an image or a page using the technology that helped create the television It involves rendering the particular image or page, pixel by pixel, in a sweeping vertical or horizontal motion, like a rake drawing lines in the dirt
A set of cells selected from the structure by a set of rules, for visualization For example, the row and column raster select, starting from the cursor, a single rank in one dimension an all ranks in another dimensions that intersect that rank The raster for the vanishing view selects all cells within a given radius of the cursor
Also referred to as bitmap images, these are images that are represented by a sequence of pixels (picture elements) or points, which when taken together, describe the display of an image on an output device There are many different raster image formats in use, among them GIF, JPEG, PCX, and TIFF
A rectangular grid of pointed observations, where at each position the observation is repeated It is defined by the centre position, the step sizes in Right Ascension and Declination, and by its orientation on the sky
A single, horizontal line of an electronic page that contains pixels A high-resolution image with 600 x 600 pixels generates 600 dpi on each raster line, with 600 lines per inch in the vertical direction
A cellular data structure composed of rows and columns Groups of cells represent features The value of each cell represents the value of the feature Image data is stored using this structure
A graphic which is made of pixels or dots - as opposed to vector in which the graphic is described by curves and algorithms Raster graphics can be scaled down effectively but usually not up
* - displays and databases build all geographic features from grid cells in a matrix A raster display builds an image from pixels, pels, or elements of coarse or fine resolution A raster database maintains a similar "picture" of reality in which each cell records some sort of information averaged over the cell's area The size of the cell may again be coarse or fine, ranging from centimeters to kilometers Many satellites, like Landsat, transmit raster images of the earth's surface Reflectance at a certain wavelength is measured for each cell in an image The cells may cover areas on the earth's surface several hundreds of meters square, the area covered being a function of a particular satellite's resolution
Common GIS data model made up of a grid of cells or pixels Each pixel contains a single value
A data file or structure representing a generally rectangular grid of pixels, or points of colour, on a computer monitor, paper, or other display medium
Using a process called bitmapping, a digital image file is created by saving each bit of an original image instead of saving lines plotted between points Raster files are capable of high definition and color depth but are difficult to manipulate without loss of quality Scanners create raster images Compare vector graphics
Digital images created or captured (for example, by scanning in a photo) as a set of samples of a given space A raster is a grid of x-axis (horizontal) and y-axis (vertical) coordinates on a display space (Three-dimensional images also have a z-coordinate ) A raster image identifies the monochrome or color value to illuminate each of these coordinates with The raster image is sometimes referred to as a bitmap because it contains information that is directly mapped to the display grid A raster image is usually difficult to modify without loss of information Examples of raster-image file types are BMP, TIFF, GIF, and JPEG files See also vector graphics
Also know as a bitmapped image, it consists a series of lines of information that form a grid of image data The image data is usually referred to as pixels
Paint and image-editing software programs such as Adobe Photoshop generate images that use a grid of small squares (pixels) to represent graphics Each pixel in a raster image has a specific location and color value assigned to it, and is part of a mosaic that gives the appearance of a different image Raster images are the most common format for photographs or images created in painting programs, because they can represent subtle gradations of shades and color