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interlacing
(Bilgisayar) Interlacing (also known as interleaving) is a method of encoding a bitmap image such that a person who has partially received it sees a degraded copy of the entire image. When communicating over a slow communications link, this is often preferable to seeing a perfectly clear copy of one part of the image, as it helps the viewer decide more quickly whether to abort or continue the transmission
occurs when an image begins to be built on the screen while the image file is still being downloaded
Images can be saved in an interlaced format, so that rather than consecutively displaying the lines that make up the image, the image displays every eighth line and than every fourth line so that the viewer can see a preview Presenting interlaced images lets the reader begin scrolling through the page while the image loads Interlaced GIF's, Progressive JPEG's, and PNG's are all examples of interlaced file formats
Synonym interlaced scanning
B4 2 3 2, p22
Painting graphics on screen by skipping rows (normally every 4th: 1,5,9 then 2,6,10; 3,7,11; and finally 4,8,12) This allows the viewer to see the entire image in poor quality immediately, rather than waiting until the complete image has been downloaded in good quality
Interlacing is a method of displaying image on the screen in its entirety but at low blocky resolution as soon as image appears on the screen As the image data continues to load, image quality improves Interlacing is useful option for big images that will be used in WWW Interlacing only applies to images saved in the GIF and PNG format
plural of interlace
When the cathode-ray tube (CTR) on a monitor scans every row to display information on the screen It tends to flicker The best computer monitors are non-interlacing
Enables an image to load in several stages of resolution Creates the illusion that graphics (and, therefore, whole pages) load more quickly and gives the reader a chance to see a fuzzy recognizable image quickly enough to know whether to wait or move on
The image slowly appears in focus, as the page loads, because the browser focuses during several passes through the complete image Non-interlaced images, by contrast, load a line at a time from top to bottom, as the browser loads and focuses the image in a single pass
A scanning system that reduces flicker on computer screen In this system even lines of the image are scanned during one downward sweep of the scanning beam and remaining odd lines are scanned during the nest downward sweep of the scanning beam
A video display technique in which the electron beam refreshes (updates) all odd-numbered scan lines in one sweep of the screen and all even-numbered scan lines in the next Interlacing takes advantage of both the screen phosphor's ability to maintain an image for a short time before fading and the human eye's tendency to average subtle differences in light intensity By refreshing alternate lines, interlacing halves the number of lines to update in one screen sweep
Storage or transfer of information other than in a "natural" sequence Interlacing is commonly used in televisions and computer display screens On an interlaced display, the electron beam first scans all the even numbered lines on the raster, then all the odd numbered lines, covering the whole frame in two scans This doubles the vertical resolution without increasing the scan rate The cost of this increased resolution is that any given pixel is refreshed only half as often For an interlaced display to appear flicker-free, it may need a phosphor with a higher persistence
linked or locked closely together as by dovetailing
Even known as progressive display Both GIF, JPG and TIFF has supported this features since about 1990
{i} method of display in which even and odd lines are scanned separately on the screen so that the display seems to skip (Computers)
Process in which a monitor's video adapters scan only every other line with each field, first the odd, and then the even Interlacing allows the adapter to create higher resolutions, but the fading of the phosphors between each pass can cause the screen to flicker Non-interlaced monitors don't skip any rows and provide the highest quality image Related terms: Field, Monitor, Resolution, Video adapter, Phosphors
A variation of the GIF file format that allows browsers which support interlacing to begin to build a low-resolution version of the full-sized GIF picture on the screen while the file is still downloading
this method loads an image with bits scattered all over the image The image starts displaying hazy or fuzzy, and as loading proceeds, it becomes clearer and clearer
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