Test Card F

BBC Test Card F as seen on BBC One from 17 February 1991 to 4 October 1997.

Test Card F is a test card that was created by the BBC and used on television in the United Kingdom and in countries elsewhere in the world for more than four decades. Like other test cards, it was usually shown while no programmes were being broadcast. It was the first to be transmitted in colour in the UK and the first to feature a person,[1] and has become an iconic British image regularly subject to parody.

The central image on the card shows eight-year-old Carole Hersee (born 1958)[2] playing noughts and crosses with a clown doll, Bubbles the Clown, surrounded by various greyscales and colour test signals needed to ensure a correct picture. It was first broadcast on 2 July 1967 (the day after the first colour pictures appeared to the public on television) on BBC2.

The card was developed by a BBC engineer, George Hersee (1924–2001), father of the girl in the central image. It was frequently broadcast during downtime on BBC1 until that channel went fully 24 hours in November 1997, and on BBC Two until its downtime was replaced entirely by Pages from Ceefax in 1998, after which it was only seen during engineering work, and was last seen in this role in 1999. The card was also seen on ITV in the 1970s. It was also seen on Sveriges Television in an unknown time period. [3]

In the digital age Test Card F and its variants are very infrequently broadcast, as downtime in schedules has largely become a thing of the past. Several variations of TCF have been screened, among them Test Card J (digitally enhanced), Test Card W (widescreen) and its high definition variant, which is sometimes erroneously referred to as Test Card X.

Up until the UK's digital switchover, the testcard made an annual appearance during the annual RBS (rebroadcast standby)[4] Test Transmissions and, until 2013, during the BBC HD preview loop, which used Test Card W.

Technical information

Virtually all the designs and patterns on the card have some significance. Along the top (see above) are 95% colour-bars in descending order of luminance—white, yellow, cyan, green, magenta, red, blue and black. There are triangles on each of the four sides of the card to check for correct overscanning of the picture. Standard greyscale and frequency response tests are found on the left and right respectively of the central picture. On the updated Test Card J, the X on the noughts-and-crosses board is an indicator for aligning the centre of the screen.

The old Test Card F (with the second BBC logo as seen from 2 July 1967 until circa 1971).

The blocks of colour on the sides would cause the picture to tear horizontally if the sync circuits were not adjusted properly. The closely spaced lines in various parts of the screen allowed focus to be checked from centre to edge; mistuning would also blur the lines. All parts of the greyscale would not be distinct if contrast and brightness (both internal preset settings and user adjustments) were not set correctly. The black bar on a white background revealed ringing and signal reflections. The castellations along the top and bottom also revealed possible setup problems.

A child was depicted so that wrong skin colour would be obvious and not subject to changing make-up fashions. The juxtaposed garish colours of the clown were such that a common transmission error called chrominance/luminance delay inequality would make the clown's yellow buttons turn white.

Modern circuitry using large-scale integration is much less susceptible to most of these problems. Some of them are also associated with cathode ray tubes; liquid crystal displays (LCDs), that are not scanned at high speed, also help. The test card was a vital tool in its day, but has become far less important.

The name of the broadcasting channel usually appeared in the space underneath the letter F—a sans-serif F denoting an original optical version of the test card.

Originally, Test Card F was a photographic slide made up of two transparencies in perfect registration—one containing the colour information and the other the monochrome background. The card was converted to electronic form in 1984 when electronic storage became possible.

Test Card F music

A sound of some kind is usually transmitted in the background. It is sometimes music, usually a composition commissioned by the station itself or "royalty-free" stock music. Composers whose music has been used include Roger Roger, Johnny Pearson, Neil Richardson and Frank Chacksfield.

However, during more recent years in which the Test Card is only played during engineering tests on the BBC, it is more common to hear a steady tone of various pitches accompanied by a female talking clock. Test Card music had ceased to be frequently heard in the 1980s (though it continued to be played over Pages From Ceefax until the termination of that service on 23 October 2012).

Bubbles the Clown

Original transparency of the central image created for Test Card F.

Along with his Test Card F co-star Carole Hersee, Bubbles has appeared for an estimated total of 70,000 hours[5] on television, equivalent to nearly eight whole years, which is more than any living person other than Carole (who still owns Bubbles).[6]

Colour

Bubbles' original body colour was blue and white, but the BBC engineers decided that green was also needed within the scene[7] as the other two television primary colours, red and blue, were already shown. A green wrap was made to cover his body and this can be seen in Test Card J and Test Card W, along with more of his body shown in the photograph[8] — revealing the fact that he is actually holding a piece of chalk, which was not previously visible.

However, the shade of green material chosen was too subtle for the engineers' liking and so Bubbles' body colour in Test Card F was retouched (this can be seen from the edges of his image) to make it more saturated and also to give it a higher luminance value on screen.[7]

Recent years

Since the late 1990s, Bubbles has only very rarely appeared on television as Test Card F has been discontinued, and Test Cards J and W are very seldom shown due to the advent of digital television and 24-hour programming.[8] From 1983 Test Card F was gradually seen less due to Ceefax pages being shown more; by the late 1980s Test Card F was only seen early in the morning as all the remaining gaps in the day's programming were filled with programmes. 1992 was the last year that Test Card F was seen daily with music; 1995 was the last year it was seen with music, although it was seen until 1999 with just tone output; Ceefax was broadcast either with tone or music.

For the fortieth anniversary of Test Card F, there was some renewed interest in Bubbles in the media; in a 2007 interview, Hersee mentioned that she took Bubbles into school with her to prove to her headmaster that she really was the girl in the picture.[9]

The BBC website (as of April 2016) continues to feature Bubbles next to a blackboard with '404' inscribed on it when a user visits a page that does not exist.[10] Similarly, the BBC website's '500' Internal Error page features Bubbles next to a blackboard but with fire in the background.[11]

In popular culture

Variations and parodies of Test Card F are common in British broadcasting, Internet sites and games.

Television

Other

See also

References

  1. 1 2 "Revamped testcard gets a touch of Klass". Daily Mail. 22 May 2007. Retrieved 10 June 2013.
  2. ↑ Prigg, Mark (5 January 2009). "Do adjust your sets: 10 years on, the 'Carole and clown' test card is back". Daily Mail. Retrieved 10 June 2013.
  3. ↑ http://hub.tv-ark.org.uk/images/testcards/images/43_testcards/tcf_farg_tv_sweden-01.jpg
  4. ↑ https://www.youtube.com/watch?v=ix6uqyLvpds
  5. 1 2 3 "Test card special". BBC News. 19 April 2001. Retrieved 10 June 2013.
  6. ↑ Deacon, Michael (25 May 2007). "Talking about the Test Card". The Telegraph. Retrieved 10 June 2013.
  7. 1 2 Grant, Dave. "Test Card ‘F’". The Test Card Gallery. Retrieved 10 June 2013.
  8. 1 2 Meldrum, Darren. "BBC Test Cards". MHP The Test Card Gallery. Retrieved 10 June 2013.
  9. ↑ Personal Column: Test-card special The Independent.
  10. ↑ "404 page". BBC. Retrieved 30 April 2016.
  11. ↑ "BBC website down: Incredibly creepy clown in error message is freaking people out". Mirror. Retrieved 9 July 2015.
  12. ↑ Johnny Vegas: Veteran Newcomer. BBC News
  13. ↑ Madness – Ghost Train music video on YouTube – first seen at 10 seconds into the video introduction

External links

BBC links

Interviews

Others

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