Lesson 7 (The Kinds of Printer and Scanner).pptx

The Kinds of Printer and Scanner Prepared by: Kristine Emerald Llunar Scanners vs. Printers The key difference between a printer and a scanner is: A printer is a peripheral device that creates a solid copy of the digital data that is represented on the computer screen. Printe...

The Kinds of Printer and Scanner Prepared by: Kristine Emerald Llunar Scanners vs. Printers The key difference between a printer and a scanner is: A printer is a peripheral device that creates a solid copy of the digital data that is represented on the computer screen. Printers can be used to connect to a computer using a USB or wirelessly. A scanner, also known as an image scanner, is a peripheral device that is used to turn solid data into digital data. A document before printing it and processing it for the printing process can be easily edited and altered while in case of the scanner, the digital document is altered after its generation by scanning the solid object Types of Scanner Flatbed Scanners – takes up some desktop space but provide a lot of bang for the buck. They look like miniature printers with a flip-up cover protecting the glass platen. Depending on their size, these can fit standard or legal-sized documents, and the flexible cover allows you to scan large items such as books. These scanners are great for scanning the occasional newspaper article, book chapter, or photograph; or for those who may need to scan or bulky items such as the cover of a DVD. Flatbed scanners are often built into multifunction printers (MFPs). Types of Scanner Paper Fed or Sheetfed – are smaller than flatbed scanners; as the name implies, you feed a document or photo into the scanner rather than place it on top. You’ll win back some of that desktop space with a sheetfed scanner but you may sacrifice some resolution in the process. If you’re only scanning documents, however, it may be a worthwhile trade, especially if you’ve got a lot of them since you can feed them in bunches. With a flatbed scanner, you’ll have to scan one page at a time (unless it comes with an automatic document feeder). Types of Scanner Drum Scanner – is a type of scanner used to capture the highest resolution from an image. The original document to be scanned is wrapped around a drum and then scanned by moving the detector head longitudinally as the drum is rotated Drum scanners are used where the highest resolution is required, as in scanning high-quality photographs for print reproduction. The scanner captures the image with analog light, producing the most detail possible in each color channel and then converts it to a digital file Types of Scanner Handheld Scanner – is a portable electronic device that scans physical documents into digital formats. It can be used to store, edit, transfer and email the scanned documents digitally. It can also scan barcodes and access the information behind them. It consists of light emitting diodes and has controls and a display for different scan modes and memory status. It has to be moved at a constant speed over the document to get good quality scans. Types of Scanner Portable Scanners - are small enough to bring on the road. In fact, some are small enough to put in your pocket; pen scanners are just a bit bigger than fountain pens and can scan the text of a document line by line. Some are as wide as a page and roll easily down the page. They’re not going to give high-resolution scans and so aren’t good for scanning photographs or other applications where you need a high-quality result. Since they’re not cheaper than flatbed scanners, they’re probably only useful if you are a student, a researcher, or a spy. Types of Scanner Photo Scanners - scanning documents doesn’t require high resolution or color depth; but scanning photos does. Many all-purpose scanners can also scan photos, meaning that you don’t need a separate device to handle your photographs. But if you need a scanner primarily to digitize film negatives or slides, a photo scanner might be better deal (even if it is considerably more expensive than an all-purpose scanner). Photo scanners include specialized technology so that they can deal with slides and negatives; they also have built-in software to clean up old photos. 2 Major category of Printer: 1. Impact printer - produces an output by using a mechanism that process against the ink ribbon or paper. 2. Non impact printer - a photo copier like, process to transfer ink to a piece of paper. It also more expensive than the impact printer. The Key differences are: Impact printers involve mechanical components for conducting printing, while non- impact printers do not use mechanical moving components. Non-impact printers deposit ink over the paper using any mechanism, while impact printers use needles to print. Impact printers produce character outputs but cannot produce live images easily, unlike non-impact printers, which can also produce a print of images. The price of ink required for a non-impact printer becomes its biggest drawback, whereas the cost of needles for an impact printer always stays lower than that of the ink and hence becomes an advantage. The speed of a non-impact printer remains much faster than an impact printer because of the technology and usually prints words three times faster than impact printer. Kinds of Printer: Ink Jet/ Bubble Jet printer- use ink to print. The quality of the print is determined by the DPI (Dots Per Inch). Dot-matrix printer- creates characters by striking pins against an ink ribbon. Each pin makes a dot and combination of dots from characters and illustration. Laser Printer – uses tuner and an internal laser to print. 3 Core Aspects Computer Technology Hardware Software Peopleware Software Refers to the set of instructions written in a code that computers can understand and execute. a set of computer programs, procedure and possibly associated documentation concerned with the operations of data processing system. Types of Software 1. Application Software- programs and data that are used for the benefit of the users. 2. System Software- programs and data are used for the benefit of the computer. Ex. Windows 98, DOS, Windows XP Peopleware the most important component of a computer system is collectively referred to as people ware. is made up of the people responsible for maintaining, operating, programming and analyzing the output generated by the computer system.