2015-08-21
6780
What does a scanner do?
A scanner'sees'images and converts the printed text or pictures into electronic codes that can be understood by the computer. With a flatbed colour scanner, the paper with the image is placed face down on a glass screen, as with a photocopier. Beneath the glass are the lighting and measurement devices. Once the scanner is activated, it reads the image as a series of dots and then generates the digitized image that is sent to the computer and stored as a file.
The scanner operates by using three rotating lamps, each of which has a different coloured filter: red, green and blue.The resulting three separate images are combined into one by appropriate software.
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What does a digital camera do?
A digital camera takes photos electronically and converts them into digital data (binary codes made up of 1 s and Os). It doesn't use the film found in a traditional camera; instead it has a special light-sensitive silicon chip.
Photographs are stored in the camera's memory card before being sent to the computer. Some cameras can also be connected to a printer or a TV set to make viewing images easier. This is usually the case with camera phones - mobile phones with a built-in camera.
What does a camcorder do?
A camcorder, or digital video camera, records moving pictures and converts them into digital data that can be stored and edited by a computer with special video editing software.
Digital video cameras are used by home users to create
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computer art and video ^^^
conferencing. ^^^^^^
They are also used to send live video images via the Internet. In this case they are called web cameras, or webcams.
Scanners
e Listen to a conversation between Vicky Cameron, an Information Technology (IT) lecturer, and one of her students, and complete the student's notes.
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I The technology used Ln scanners lS SLrnLlar Lo Chat used Ln a......................................................................................
2. The Scanned Linage LS Sent. Lo the......................................................., oohere ljOo can manipulate lL.
3 To Scan tex*t, vjOu need Special softujare called.............................................................................................................
4- Flatbed scanners can scan.................................................................................................................................................
S SlLde scanners are used to scan _______________________ _....:............................................. or fulm negatcv/es.
C=> Handheld scanners are used for capturLng..._..................................................... „........................................................
Л slide scanner
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Facts and opinions
What is the difference between facts and opinions? Complete these definitions.
1..................... are real, objective information.
2.................... usually include emotive words and subjective statements.
| The ScanPress DF is a self-calibrating flatbed scanner with 2,400 dpi of resolution. You can scan everything from black and white to 24-bit colour. The package includes a hardware accelerator for JPEG compression and decompression. JPEG technology saves disk space by compressing images by up to 50 to 1. In creating the ScanPress DF, we have chosen the most advanced technology to give you the best scans with the least effort. It produces images with high colour definition and sharpness. And it comes with OCR software and Adobe Photoshop, so you can manipulate all the images you capture. The ScanPress DF is a fantastic machine that you will love working with. And at only £309, an excellent investment. |
Read these advertisements and underline the facts and^frcj^the opinions.
