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The following other wikis use this file: Usage on ab.wikipedia.org Акәакьиаша; Usage on ar.wikipedia.org مستطيل; Usage on as.wikipedia.org
In Euclidean plane geometry, a rectangle is a rectilinear convex polygon or a quadrilateral with four right angles. It can also be defined as: an equiangular quadrilateral, since equiangular means that all of its angles are equal (360°/4 = 90°); or a parallelogram containing a right angle. A rectangle with four sides of equal length is a square.
Most computer images are stored in raster graphics formats or compressed variations, including GIF, JPEG, and PNG, which are popular on the World Wide Web. [4] [5] A raster data structure is based on a (usually rectangular, square-based) tessellation of the 2D plane into cells, each containing a single value. To store the data in a file, the ...
The luma sampling rate for 480i pictures was 12 + 3 ⁄ 11 MHz and for 576i pictures was 14 + 3 ⁄ 4 MHz. The term pixel aspect ratio was first coined when ITU-R BT.601 (commonly known as Rec. 601 ) specified that standard-definition television pictures are made of lines of exactly 720 non-square pixels.
In actual images, these extra pixels are often partly or entirely black, as only the center 704 horizontal pixels carry actual 4:3 or 16:9 image. Hence, the actual pixel aspect ratio PAR for PAL video is a little different from that given by the formula, specifically 12:11 for PAL and 10:11 for NTSC.
The following other wikis use this file: Usage on br.wikipedia.org Diplôme national du brevet; Usage on en.wikibooks.org Mirad Grammar/Word Families
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