|
Raster
Raster may refer to: * Raster graphics, graphical techniques using arrays of pixel values * Raster graphics editor, a computer program * Raster scan, the pattern of image readout, transmission, storage, and reconstruction in television and computer images * Rasterisation, or rasterization, conversion of a vector image to a raster image * Raster image processor, or RIP, a component of a printing system that performs rasterisation * Raster interrupt, a computer interrupt signal * Raster to vector, an image conversion process * Raster bar, an effect used in computer demos * Raster-Noton, a record label * Rastrum, a device used in medieval music manuscripts to draw staff lines * Raster Document Object, a file format People * Hermann Raster (1827–1891), German Forty-Eighter See also * Rasta (other) Rasta may refer to: * Rastafari, a movement and religion or a follower of that movement * Rasta (Congo), warlords from the Second Congo War * Rasta (Mandaeism) a white rel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hermann Raster
Hermann Raster (May 6, 1827 – July 24, 1891) was an American editor, abolitionist, writer, and anti-temperance political boss who served as chief editor and part-owner of the ''Illinois Staats-Zeitung'', a widely circulated newspaper in the German language in the United States, between 1867 and 1891. Together with publisher A.C. Hesing, Raster exerted considerable control over the German vote in the Midwest and forced the Republican Party to formally adopt an anti-prohibition platform in 1872, known as the Raster Resolution. He was appointed as Collector of Internal Revenue for the First District of Illinois by President Ulysses S. Grant but resigned from this post shortly thereafter. Raster returned to Europe in 1890 when his health began to fail him and died filling a minor diplomatic role in Berlin. Today he is best remembered for his extensive correspondence with Western intellectual and political figures of the time, such as Joseph Pulitzer, Elihu Washburne, and Francis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raster Graphics
upright=1, The Smiley, smiley face in the top left corner is a raster image. When enlarged, individual pixels appear as squares. Enlarging further, each pixel can be analyzed, with their colors constructed through combination of the values for red, green and blue. In computer graphics and digital photography, a raster graphic represents a two-dimensional picture as a rectangular matrix or grid of square pixels, viewable via a computer display, paper, or other display medium. A raster is technically characterized by the width and height of the image in pixels and by the number of bits per pixel. Raster images are stored in image files with varying dissemination, production, generation, and acquisition formats. The printing and prepress industries know raster graphics as contones (from ''continuous tones''). In contrast, line art is usually implemented as vector graphics in digital systems. Many raster manipulations map directly onto the mathematical formalisms of linear al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raster Graphics Editor
A raster graphics editor is a computer program that allows users to create and edit images interactively on the computer screen and save them in one of many raster graphics file formats (also known as bitmap images) such as JPEG, PNG, and GIF. Comparison to vector graphic editors Vector graphics editors are often contrasted with raster graphics editors, yet their capabilities complement each other. The technical difference between vector and raster editors stem from the difference between vector and raster images. Vector graphics are created mathematically, using geometric formulas. Each element is created and manipulated numerically; essentially using Cartesian coordinates for the placement of key points, and then a mathematical algorithm to connect the dots and define the colors. Raster images include digital photos. A raster image is made up of rows and columns of dots, called pixels, and is generally more photo-realistic. This is the standard form for digital camer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raster Scan
A raster scan, or raster scanning, is the rectangular pattern of image capture and reconstruction in television. By analogy, the term is used for raster graphics, the pattern of image storage and transmission used in most computer bitmap image systems. The word ''wiktionary:raster, raster'' comes from the Latin word ''wiktionary:rastrum, rastrum'' (a rake), which is derived from ''wiktionary:radere, radere'' (to scrape); see also rastrum, an instrument for drawing musical staff lines. The pattern left by the lines of a rake, when drawn straight, resembles the parallel lines of a raster: this line-by-line scanning is what creates a raster. It is a systematic process of covering the area progressively, one line at a time. Although often a great deal faster, it is similar in the most general sense to how one's gaze travels when one reads lines of text. The data to be drawn is stored in an area of memory called the Framebuffer. This memory area holds the values for each pixel on the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rasterisation
In computer graphics, rasterisation (British English) or rasterization (American English) is the task of taking an image described in a vector graphics format (shapes) and converting it into a raster image (a series of pixels, dots or lines, which, when displayed together, create the image which was represented via shapes). The rasterized image may then be displayed on a computer display, video display or printer, or stored in a bitmap file format. Rasterization may refer to the technique of drawing 3D models, or the conversion of 2D rendering primitives such as polygons, line segments into a rasterized format. Etymology The term "rasterisation" comes . 2D Images Line primitives Bresenham's line algorithm is an example of algorithm used to render a line. Circle primitives Algorithms such as Midpoint circle algorithm are used to render circle onto a pixelated canvas. 3D images Rasterization is one of the typical techniques of rendering 3D models. Compared with other re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raster Image Processor
A raster image processor (RIP) is a component used in a printing system which produces a raster image also known as a bitmap. Such a bitmap is used by a later stage of the printing system to produce the printed output. The input may be a page description in a high-level page description language such as PostScript, PDF, or XPS. The input can also be or include bitmaps of higher or lower resolution than the output device, which the RIP resizes using an image scaling algorithm. Originally a RIP was a rack of electronic hardware which received the page description via some interface (e.g. RS-232) and generated a "hardware bitmap output" which was used to enable or disable each pixel on a real-time output device such as an optical film recorder, computer to film, or computer to plate. A RIP can be implemented as a software module on a general-purpose computer, or as a firmware program executed on a microprocessor inside a printer. For high-end typesetting, standalone hardware R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raster Interrupt
A raster interrupt (also called a horizontal blank interrupt) is an interrupt signal in a legacy computer system which is used for display timing. It is usually, though not always, generated by a system's graphics chip as the scan lines of a frame are being readied to send to the monitor for display. The most basic implementation of a raster interrupt is the vertical blank interrupt. Such an interrupt provides a mechanism for graphics registers to be changed mid-frame, so they have different values above and below the interrupt point. This allows a single-color object such as the background or the screen border to have multiple horizontal color bands, for example. Or, for a hardware sprite to be repositioned to give the illusion that there are more sprites than a system supports. The limitation is that changes only affect the portion of the display below the interrupt. They don't allow more colors or more sprites on a single scan line. Modern protected mode operating systems ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raster To Vector
In computer graphics, image tracing, raster-to-vector conversion or raster vectorization is the conversion of raster graphics into vector graphics. Background An image does not have any structure: it is just a collection of marks on paper, grains in film, or pixels in a bitmap. While such an image is useful, it has some limits. If the image is magnified enough, its artifacts appear. The halftone dots, film grains, and pixels become apparent. Images of sharp edges become fuzzy or jagged. See, for example, pixelation. Ideally, a vector image does not have the same problem. Edges and filled areas are represented as mathematical curves or gradients, and they can be magnified arbitrarily (though of course the final image must also be rasterized in to be rendered, and its quality depends on the quality of the rasterization algorithm for the given inputs). The task in vectorization is to convert a two-dimensional image into a two-dimensional vector representation of the image. It is not ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raster Bar
The raster bar (also referred to as rasterbar or copperbar) is an effect used in demos and older video games that displays animated bars of colour, usually horizontal, which additionally might extend into the border, a.k.a. the otherwise unalterable area (assuming no overscan) of the display. Raster bar-style effects were common on the Atari 2600 and Atari 8-bit family (because they could be easily displayed using the hardware of those systems) and then later in demos for the Commodore 64, Amiga, Atari ST, and Amstrad CPC. The term ''copperbar'' comes from a graphics coprocessor on the Amiga home computer referred to as the Copper (a shortened form of coprocessor). It can be programmed to change the display colors per scan line without requiring the CPU, except to update the position of the bars once per frame. Horizontal raster bars Such computers had limited graphical abilities and usually a fixed number of colours or inks (''e.g.'' a maximum of 16 on the Amstrad CPC) that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raster-Noton
Raster-Noton was a German electronic music record label. It was established in 1999 in Chemnitz, Germany. It emerged from the fusion of Rastermusik, founded by Olaf Bender and Frank Bretschneider in 1996, and Noton (''Archiv für Ton und Nichtton''), a sub label that was run by Carsten Nicolai. In 2017, the label split into two entities: Raster, to be run by Bender, and Noton, focusing on Nicolai's output. "raster-noton. archiv für ton und nichtton" is meant to be a platform — a network covering the overlapping border areas of pop, art, and science. It realizes music projects, publications, and installation works. A common idea behind all releases is an experimental approach — an amalgamation of sound, art, and design, which is apparent in the music and visible from the artwork and cover design. The collective label's aesthetic focuses on rhythmic, minimal electronic music alternating between playful pop and introspection. Artists Catalogue 20' to 2000 ''20' to 20 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rastrum
A rastrum () or raster is a five-pointed writing implement used in music manuscripts to draw parallel staff lines when drawn horizontally across a blank piece of sheet music. The word "raster" is derived from the Latin for "rake". Rastra were used to draw lines on paper that had not been pre-ruled, and were widely used in Europe until printed staff paper became cheap and common in the nineteenth century. Some rastra are able to draw more than one staff at a time. Rastrology, the study of the use of the rastrum, is a branch of music manuscript studies that uses information about the rastrum to help find the date and provenance of musical materials. Modern variants In recent years, rastra made of five ballpoint pens have been marketed to students and composers. It was common in primary and secondary schools to use rastra that use chalk on a chalk board for music education. They may be called staff liners. An alternative is to use a chalk board with staff lines etched in or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raster Document Object
The .RDO (Raster Document Object) file format is the native format used by Xerox's DocuTech range of hardware and software, that underpins the company's "Xerox Document On Demand" "XDOD" systems. It is therefore a significant file format for the "print on demand" market sector, along with PostScript and PDF. RDO is a metafile format based on the Open Document Architecture (ODA) specifications: In Xerox's RDO implementation, description and control information is stored within the RDO file, while raster images are stored separately, usually in a separate folder, as TIFF files. The RDO file dictates which bitmap images will be used on each page of a document, and where they will be placed. Features and disadvantages This approach has advantages and disadvantages over the monolithic approach used by PDF: The disadvantages of RDO are that it is a largely proprietary format, and the multi-file approach means that file management and orphan control is more of an issue: one cannot tell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
