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U3L7 Science
| Question | Answer |
|---|---|
| When you scan something with a scanner, you are | Scanning an image |
| any image on a computer is called a | digital image |
| When you "digitize" an image, a computer does what | It converts the real world colour and light to a numeric value which consists of rows of millions of colour samples. |
| The samples numeric colour data values are called | Pixels |
| What is resolution | The number of pixels per unit area |
| What is CCD | Charged couple device. It is used to convert images to pixels |
| What is pixel short for | Picture Element |
| if a picture on a computer is black and white, what happens to the number that corresponds to a certain colour the pixel has too be | It is assigned to a shade of grey |
| The part of the camera that allows light to enter is called the | aperture in a camera |
| The aperture is comparable to the | pupil in the human eye |
| the part of the camera that controls how much light enters is called the | diaphragm in a camera |
| the diaphragm in a camera is comparable to the | iris in the human eye |
| The part of the camera that covers the aperture is called the | shutter in a camera |
| The shutter in a camera is comparable to the | eyelids in the human eye |
| the part of the camera that forms an image when light hits it is called the | film in a camera |
| the film in a camera is comparable to the | retina in the human eye |
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