Digital imaging

Developed in the 1970s, digital imaging is the conversion of images into binary language to be stored on a computer's memory. Images can be captured by scanning or by a digital camera - video images can also be digitized. In digital cameras film is replaced by a small chip (CCD) which reacts to light like film, but instead of storing an image chemically, converts it into digital form. The data that makes up this image can be viewed on a computer screen as a pattern of tiny squares called pixels. Through the use of various kinds of software it can be stored, transferred into a multimedia programme, manipulated, enhanced, or simply printed out.

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Elton John, by Terry O

Elton John
by Terry O'Neill
1975
NPG x126151

Mohamed al-Fayed, by Robin Laurance, 1980 - NPG  - © Robin Laurance / National Portrait Gallery, London

Mohamed al-Fayed
by Robin Laurance
1980
NPG x128605

Adam Faith, by Max Adelman, 1986 - NPG  - © Max Adelman / National Portrait Gallery, London

Adam Faith
by Max Adelman
1986
NPG x132265

Catherine Zeta Jones, by Terry O

Catherine Zeta Jones
by Terry O'Neill
1997
NPG x126157

Shirley Bassey, by Mike Owen, 1997 - NPG  - © Mike Owen / National Portrait Gallery, London

Shirley Bassey
by Mike Owen
1997
NPG x128532

Prince Philip, Duke of Edinburgh; Queen Elizabeth II, by Terry O

Prince Philip, Duke of Edinburgh; Queen Elizabeth II
by Terry O'Neill
30 January 1992
NPG x126160

Alan Sugar, by Harry Borden, 15 March 2001 - NPG  - © Harry Borden

Alan Sugar
by Harry Borden
15 March 2001
NPG x127003

Tricky, by Sal Idriss, 26 July 2003 - NPG  - © Sal Idriss / National Portrait Gallery, London

Tricky
by Sal Idriss
26 July 2003
NPG x126229

Chefs

Chefs' Last Supper
by John Reardon
2003
NPG P1121

Sir Anish Kapoor, by Trevor Ray Hart, 2003 - NPG  - © Trevor Ray Hart

Sir Anish Kapoor
by Trevor Ray Hart
2003
NPG x126336

Alan Yau, by Palani Mohan, November 2004 - NPG  - © Palani Mohan

Alan Yau
by Palani Mohan
November 2004
NPG x128070

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