question: why do striped shirts look wavy on TV
comment: It is called the Moiré effect. It happens when the pattern of the shirt lines up with the rows and columns of the camera's sensor, making the image brighter. At other places and times it doesn't line up and the image is darker.
passages: Interlace introduces a potential problem called interline twitter, a form of moiré. This aliasing effect only shows up under certain circumstances—when the subject contains vertical detail that approaches the horizontal resolution of the video format. For instance, a finely striped jacket on a news anchor may produce a shimmering effect. This is "twittering". Television professionals avoid wearing clothing with fine striped patterns for this reason. Professional video cameras or computer-generated imagery systems apply a low-pass filter to the vertical resolution of the signal to prevent interline twitter.
   Film recorded for the purposes of United Kingdom television production is usually recorded at 25 frames per second; there is an unrecorded temporal gap between each frame and the next. In contrast, video pictures are recorded as a stream of video fields. Each field can be loosely seen as half a frame, but each field is also a discrete image separated from the previous field by 1/50 second. This difference in the rate of change of the image is one of the factors contributing to the "video look", familiar to viewers as the more immediate, "live" feel seen in many soap operas and sports programmes.
   BULLET::::- Emmett Miller; former weekend anchor during the early 1990s, most recently anchor at KTLA until leaving in October 2010
  
  BULLET::::- Diana Morgan, anchor-turned-actress, seen in series such as "JAG", "The Bold and the Beautiful", "Babylon 5" and "The West Wing" and films such as "Titanic"
  
  BULLET::::- Byron Pitts, military reporter from 1984 to 1986, now at ABC News
  
  BULLET::::- Charles Pugh, anchor/reporter in the 1990s; Served as a weekend anchor and reporter at WJBK-TV in Detroit from 1999 to 2009; Was president of the Detroit City Council until resigning in 2013
   BULLET::::- Barbara Ciara, weekend co-anchor from 1983 until 1988, when she left for WVEC. Now working at WTKR; also former President of the National Association of Black Journalists
  
  BULLET::::- Lloyd Dobyns, news co-anchor in the 1960s with Vern Jones; Later a correspondent and anchor with NBC News (1969–1986) where he hosted the news magazine "Weekend" from 1974 to 1979; winner of a Peabody Award
  
  BULLET::::- Ahmed Fareed, sports anchor from 2005-2010, now a studio host and reporter at Comcast SportsNet Bay Area
   Section::::Implications and applications.:Television screens and photographs.
  
  Moiré patterns are commonly seen on television screens when a person is wearing a shirt or jacket of a particular weave or pattern, such as a houndstooth jacket. This is due to interlaced scanning in televisions and non-film cameras, referred to as interline twitter. As the person moves about, the moiré pattern is quite noticeable. Because of this, newscasters and other professionals who appear on TV regularly are instructed to avoid clothing which could cause the effect.
   On May 2, 2007, the program unveiled its second-generation on-air graphics package, replacing what was used – including its opening graphic sequence – since its March 14, 2005 debut. In the previous graphics package, the program's lower third changed its background color from red to yellow on November 26, 2007.
   In 1974, the new look was to replace the previous look which had been going in one form or another for seven years. The tenth anniversary of BBC2 was also that year, and so a new ident would have been greatly appreciated to celebrate the station. The new look would also coincide with the updated mirror globe look used by BBC1 and a new look to both channels as a whole.
  
  Section::::Components of Look.
   BULLET::::- A version of the ident where the background was yellow, and the white lines were black, was used before a Shirley Bassey programme.
  
  BULLET::::- A variation was used to introduce "Open Space", which featured the 2 revolving out, but a map of the UK reforming in its place.
  
  Some information about Christmas idents during this period exists.
  
  BULLET::::- Christmas 1975 - The new double-striped '2' formed out of tinsel.
  
  BULLET::::- Christmas 1976 - A sequined layout version of the 2.
   BULLET::::- Rhonda Glenn, weather reporter, talk show host and anchor in the 1960s and 1970s. Golf commentator for ABC (1978-1994); First full-time national TV network female sportscaster (ESPN, February 6, 1981); Amateur golfer and author of dozens of magazine articles and books on the sport; Manager of Communications for the USGA (deceased)
  
  BULLET::::- Hillary Howard, former weekend meteorologist during the late 1980s, now a host for WTOP-FM in Washington, D.C.
  
  BULLET::::- Lisa Joyner, formerly at "The Best Damn Sports Show Period", currently host of TV Guide Channel's "inFANity"
  
  BULLET::::- Oren Liebermann, CNN International Jerusalem correspondent
   A clock accompanied the look and featured a light blue face and hands with a white corporate BBC2 logo. The face included a 'polo mint' centre circle from which the hands radiated out of, and counters that got progressively thicker the further round the clockface. This was either on a navy blue, or black background, depending on the ident that preceded or succeeded it.
   On September 1, 2016, when ABC converted to a widescreen presentation, CBS and The CW were the only remaining networks which frame their promotions and on-screen graphical elements for a presentation, though with CBS Sports's "de facto" 16:9 conversion with Super Bowl 50 and their new graphical presentation designed for 16:9 framing, in practice most CBS affiliates ask pay-TV providers to pass down a 16:9 widescreen presentation by default over their standard definition channels. This continued for CBS until September 24, 2018 when the network converted its on-screen graphical elements to a 16:9 widescreen presentation for all non-news and sports programs; although it still operates on a 4:3 presentation for the CBS Dream Team block.
   Photographs of a TV screen taken with a digital camera often exhibit moiré patterns. Since both the TV screen and the digital camera use a scanning technique to produce or to capture pictures with horizontal scan lines, the conflicting sets of lines cause the moiré patterns. To avoid the effect, the digital camera can be aimed at an angle of 30 degrees to the TV screen.
  
  Section::::Implications and applications.:Marine navigation.
   The celebrity look remained until 2006, when the Scottish and Grampian names were traded in for one unified look: STV. The first ident package featured an elongated blue 'S', with scenes of Scottish people in various locations passing around the 'S' from person to person in differing scenes, until one person places the S in the centre of the screen. An updated look was introduced on 23 March 2009, consisting of a picture postcard scene which would flip over to the right to reveal another theme. This flipping increases in pace and as the camera pulls back before the STV logo forms against a gradient blue background.
   There are two ways to make this work: reduce the scan rate, or reduce the image size. When the scan rate is reduced, this is referred to as slow-scan TV. With the latter type, the number of lines in an image may be reduced to just a few dozen. The earliest mechanical television systems often used narrow channels for sending moving images. Often, the images were only a few dozen lines in size. However, most narrow-bandwidth TV nowadays uses computers and other electronic systems.
  
  Section::::See also.
  
  BULLET::::- History of television
  
  BULLET::::- List of experimental television stations
  
  BULLET::::- Moving image formats
   BULLET::::- A clock wipe is a wipe that sweeps a radius around the center point of the frame to reveal the subsequent shot, like the sweeping hands of an analog clock. Because of this similarity, it is often used to indicate that time has passed between the previous shot and the next shot. One of the TV shows that used the effect is "Regular Show". "The Red Green Show" also makes frequent use of this wipe style, featuring an animated roll of duct tape, and accompanied by the loud "yanking tape off a roll" sound effect.
   The WAVY Weather Station can be seen on Cox Cable digital channel 227 in the Greater Hampton Roads area. The WAVY Weather Station can also be seen on other cable systems and channels across Hampton Roads, Northeastern North Carolina, Northern Outer Banks of North Carolina and the Eastern Shore of Virginia.
  
  Section::::Digital television.:Analog-to-digital conversion.
   BULLET::::- Library: A girl climbs a ladder against a bookcase. As the ladder is moved, the ladder section in a different segment moves differently. Equally the girl may climb off the bottom of the screen to reappear at the top. In addition, whenever she replaced a book, another fell out in a different segment. (retired in 2016)
  
  BULLET::::- Lake: A mountain scene against a lake where a drop of water causes ripples in more than one segment, before a drop rises from the sky/lake in another segment. Used since September 2005
   BULLET::::- Weaving is done by adding consecutive fields together. This method does not cause any problems when the image has not changed between fields, but any change will result in artifacts known as "combing," when the pixels in one frame do not line up with the pixels in the other, forming a jagged edge. This technique retains the full vertical resolution at the expense of half the temporal resolution (motion).
   Early TV cameras, such as the video camera tube, did not have a shutter. Not using shutter in raster systems may alter the shape of the moving objects on the screen. On the other hand, the video from such a camera looks shockingly "live" when displayed on a CRT display in its native format.
  
  Section::::Transmission.
   BBC Scotland has historically shown its own football results programme. From 1989–2001, it was known as "Afternoon Sportscene" and it opted out of "Grandstand" at around 4:40pm when the "Final Score" segment of the programme was about to begin, and consequently the programme included a vidiprinter sequence which lasted for roughly the same time as it did on "Final Score". The programme was renamed "Sportscene Results" at the start of the 2001-02 season although it wasn't until the end of the decade that the vidiprinter was on-screen from the start of the programme until the classified results at 5pm.
   Section::::Current systems.:Scanlines.
   A weird artifact of block matching owes to the size of the block itself. If a moving object is smaller than the mosaic block, consider that it's the entire block that gets moved. In most cases, it's not an issue, but consider a thrown baseball. The ball itself has a high motion vector, but its background that makes up the rest of the block might not have any motion. The background gets transported in the moved block as well, based on the motion vector of the baseball, What you might see is the ball with a small amount of outfield or whatever, tagging along. As it's in motion, the block may be "soft" depending upon what additional techniques were used and barely noticeable unless you're looking for it.
   BULLET::::- UTV refused to adopt the look, instead opting for their in-house created landscapes look.
  
  BULLET::::- The SMG regions of Scottish Television and Grampian Television, both now branded as STV, refused to adopt the look vowing instead for their look involving Scottish people and a large elongated 'S'.
  
  The Idents themselves and their contents:
  
  Section::::Corporate images.:November 2006 – January 2013.
   Interlacing divides the frame into two fields, each containing half the number of lines. Each field is scanned in 1/60 second under the 525-line system (or 480i – often incorrectly referred to as NTSC) or 1/50 of a second under the 625-line system (or 576i – often incorrectly referred to as the PAL). With interlaced systems there are an odd number of lines in each frame. This means that there is a half line offset between the fields, therefore the lines in the second field will be positionally interleaved with the lines in the first field.
   Before the 2009 digital television transition, early high definition broadcasts often used bugs placed outside the 4:3 safe zone (sometimes with special "HD" branding) to distinguish them from the standard definition broadcast. By the late-2000s, due to networks switching to a singular HD feed downconverted for SD (assuming that the SD feed will be center-cut from the HD feed, or using Active Format Description (AFD) metadata to specify the framing format) as their network feed rather than distinct feeds for both formats, most broadcast networks dropped HD-specific logo bugs and used bugs in the 4:3 safe zone for all viewers, regardless of feed. However, by 2018, the majority of logo bugs and on-air presentation has been oriented towards 16:9 framing.
  