Such processes often rely on the detection of electromagnetic radiation that occurs beyond the light spectrum visible to the human eye, converting such signals into recognizable images. These include microscopy for the magnification of minute objects, telescopes that can observe objects at great distances, X-rays that can visually represent interior structures of the human body (among other objects), magnetic resonance imaging (MRI), positron emission tomography (PET scans), and others. On the other hand, some processes can be used to create visual representations of objects that are otherwise inaccessible to the human visual system. A black-and-white visual representation of something is still an image, even though it does not fully use the visual system's capabilities. An example of this is a greyscale ("black and white") image, which uses the visual system's sensitivity to brightness across all wavelengths without taking into account different colors. In this wider sense, images can also be rendered manually, such as by drawing, the art of painting, or the graphic arts (such as lithography or etching), rendered automatically by printing or computer graphics technology, or developed by a combination of methods.Ī two-dimensional image does not have to use the entire visual system to be a visual representation. The word 'image' is also used in the broader sense of any two-dimensional figure such as a map, graph, pie chart, painting, or banner. In the modern age, the development of plastics and other technologies made it possible to create multiple copies of a 3-dimensional object with less effort the advent and development of " 3-D printing" have expanded that capability. Some photographic processes can now render the illusion of depth in an otherwise "flat" image, but "3-D photography" ( stereoscopy) or " 3-D film" are optical illusions that require special devices such as eyeglasses to create that illusion of depth.Ĭopies of 3-dimensional images have traditionally had to be crafted one at a time, usually by an individual or team of artisans. Three-dimensional images Īside from sculpture and other physical activities that can create three-dimensional images from solid material, some modern techniques, such as holography, can create three-dimensional images that are reproducible but intangible to human touch. Lava flows at the summit crater appear in shades of green and brown, while vegetation zones appear as areas of purple, green, and yellow on the volcano's flanks. The city of Santa Cruz de Tenerife is visible as the purple and white area on the lower right edge of the island. For a mental image to be understood outside of an individual's mind, however, there must be a way of conveying that mental image through the words or visual productions of the subject.Ĭharacteristics A synthetic-aperture radar image acquired by the SIR-C/X-SAR radar on board the Space Shuttle Endeavour shows the Teide volcano. The subject of an image need not be real it may be an abstract concept such as a graph or function, or an imaginary entity. Ī mental image exists in an individual's mind as something one remembers or imagines. A fixed image, also called a hard copy, is one that has been recorded on a material object, such as paper or textile. This may be a reflection of an object by a mirror, a projection of a camera obscura, or a scene displayed on a cathode-ray tube. Ī volatile image exists or is perceived only for a short period. In optics, the term "image" (or "optical image") refers specifically to the reproduction of an object formed by light waves coming from the object. In the context of signal processing, an image is a distributed amplitude of color(s). Images can also be animated through digital or physical processes. Images may be displayed through other media, including projection on a surface, activation of electronic signals, or digital displays they can also be reproduced through mechanical means, such as photography, printmaking or photocopying. An image can be two-dimensional, such as a drawing, painting, or photograph, or three-dimensional, such as a carving or sculpture. The display of the mobile phone shows the image being made.Īn image is a visual representation of something. The act of making a 2D image with a mobile phone camera. The aim of this procedure is to find contractors within a multiple general contract for outsourcing orders in relation with graphic design services, supply of images and image processing work.For Wikipedia image use guidelines, see Wikipedia:Images.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |