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Questions and Answers

What is the primary measurement of the speed of printers?

  • Characters per second
  • Pages per minute (correct)
  • Dots per inch (dpi)
  • Lines per inch

    • What is the process by which laser printers fix the toner onto the paper?

  • With UV light
  • With pressure
  • With electrostatic charge
  • With heat (correct)

    • What is a characteristic of dot-matrix printers?

  • High resolution (600 dpi or better)
  • Typically uses electrostatic charge
  • Uses tiny blobs of ink
  • Uses an inked ribbon (correct)

    • What is the typical resolution of ink-jet and bubble-jet printers?

    <p>300 dpi or better</p> Signup and view all the answers

    What is the purpose of the drum in a laser printer?

    <p>To deposit dots of electrostatic charge</p> Signup and view all the answers

    What is an advantage of print technology?

    <p>It allows any character set or graphic to be printed</p> Signup and view all the answers

    What is a critical feature of printing?

    <p>The resolution of the printer</p> Signup and view all the answers

    What is the typical resolution of dot-matrix printers?

    <p>80-120 dpi</p> Signup and view all the answers

    What is the primary advantage of using serif fonts in printed text?

    <p>They help the eye track long lines of text</p> Signup and view all the answers

    What is the main benefit of using a page description language in printing?

    <p>It sends a description of the page to the printer</p> Signup and view all the answers

    What is the primary difference between screen and print resolution?

    <p>Print resolution is higher than screen resolution</p> Signup and view all the answers

    Which type of scanner is typically used for desktop publishing?

    <p>Flat-bed scanner</p> Signup and view all the answers

    What is the primary purpose of using scanners in document storage and retrieval systems?

    <p>To create digital copies of physical documents</p> Signup and view all the answers

    What is the typical resolution range of scanners?

    <p>600-2400 dpi</p> Signup and view all the answers

    What is the primary advantage of using serif fonts on screen?

    <p>They are less legible on screen, making sans serif fonts a better choice</p> Signup and view all the answers

    What is the primary purpose of PostScript in printing?

    <p>To send a description of the page to the printer</p> Signup and view all the answers

    What type of printer uses special heat-sensitive paper and produces poor quality prints?

    <p>Thermal printer</p> Signup and view all the answers

    What is the measurement unit of a font size?

    <p>Point</p> Signup and view all the answers

    Which font type has square-ended strokes?

    <p>Sans-serif</p> Signup and view all the answers

    Which type of printer uses a single print head for several paper rolls?

    <p>Dot-matrix printer</p> Signup and view all the answers

    What is the characteristic of a fixed-pitch font?

    <p>Every character has the same width</p> Signup and view all the answers

    What is the purpose of using uppercase letters?

    <p>Better for individual letters and non-words</p> Signup and view all the answers

    What is the advantage of lowercase letters?

    <p>Easy to read shape of words</p> Signup and view all the answers

    Which font type has splayed ends?

    <p>Serif</p> Signup and view all the answers

    What type of display technology is associated with wide screens?

    <p>Plasma</p> Signup and view all the answers

    What is a common limitation of projected displays?

    <p>Hand or body obstruction of the screen</p> Signup and view all the answers

    What is unique about situated displays?

    <p>The location of the display matters</p> Signup and view all the answers

    What is the purpose of Hermes, a situated display?

    <p>To allow office owners to read handwritten notes</p> Signup and view all the answers

    What is the characteristic of digital paper?

    <p>It is thin and flexible</p> Signup and view all the answers

    What is the advantage of using multiple projectors with clever software in projected displays?

    <p>To minimize hand or body obstruction of the screen</p> Signup and view all the answers

    What is the primary purpose of situated displays?

    <p>To provide information relevant to the location</p> Signup and view all the answers

    What is a characteristic of situated displays that are interactive?

    <p>They use touch-sensitive screens</p> Signup and view all the answers

    Where are LCD displays often found?

    <p>On PDAs, portables, notebooks, and increasingly on desktop and home TV</p> Signup and view all the answers

    What is a characteristic of LCD displays?

    <p>They reflect light</p> Signup and view all the answers

    What happens when a voltage is applied to the crystal in an LCD display?

    <p>The polarisation of the light changes</p> Signup and view all the answers

    What is a characteristic of Random Scan displays?

    <p>They draw lines to be displayed directly</p> Signup and view all the answers

    What is similar to Random Scan displays but has persistent images?

    <p>Direct View Storage Tube (DVST) displays</p> Signup and view all the answers

    Where are large displays often used?

    <p>In meetings and lectures</p> Signup and view all the answers

    What is a benefit of LCD displays?

    <p>They reduce eye strain</p> Signup and view all the answers

    What is a characteristic of the top plate in an LCD display?

    <p>It is transparent and polarized</p> Signup and view all the answers

    Study Notes

    Environment and Bio-sensing

    • Environment and bio-sensing are rapidly developing areas that involve sensors all around us, such as car courtesy lights, ultrasound detectors, RFID security tags, and temperature, weight, and location sensors.
    • Our bodies also have sensors, such as iris scanners, body temperature, heart rate, galvanic skin response, and blink rate.

    Printing and Scanning

    Printing

    • Printing involves making images from small dots, allowing for any character set or graphic to be printed.
    • Critical features of printing include resolution, size and spacing of dots, and speed, which are usually measured in dots per inch (dpi) and pages per minute, respectively.
    • Types of dot-based printers include dot-matrix, ink-jet, bubble-jet, and laser printers, which vary in resolution and cost.

    Printing in the Workplace

    • Shop tills often use dot-matrix printers, which can print on multiple paper rolls and may also print cheques.
    • Thermal printers are simple and low-maintenance, but produce poor-quality prints and are often used in fax machines.

    Fonts

    • A font is a particular style of text, and its size is measured in points, with 1 point being approximately 1/72 of an inch.
    • Fonts can be fixed-pitch, where every character has the same width, or variable-pitched, where characters have varying widths.
    • Serif fonts have splayed ends, while sans-serif fonts have square-ended strokes.

    Readability of Text

    • Lowercase letters are easier to read, while uppercase letters are better suited for individual letters and non-words.
    • Serif fonts are helpful for long lines of printed text, but sans-serif fonts are often better on screen.

    Page Description Languages

    • Pages can be converted into bitmaps and sent to printers, but this can be huge.
    • Alternatively, page description languages like PostScript can be used, which send a description of the page and instructions for curves, lines, and text in different styles.

    Screen and Page

    • WYSIWYG (what you see is what you get) is the aim of word processing, but screens and print have different resolutions and orientations.
    • Different designs and graphics are needed for screen and print.

    Scanners

    • Scanners take paper and convert it into a bitmap, with types including flat-bed and hand-held scanners.
    • Scanners shine light at paper and note the intensity of reflection, capturing colour or greyscale images.
    • Typical scanner resolutions range from 600-2400 dpi.

    Scanners (ctd)

    • Scanners are used in desktop publishing for incorporating photographs and other images.
    • They are also used in document storage and retrieval systems, doing away with paper storage.

    Extra Topics

    Interaction Design, Design Paradigms

    • In HCI, interaction design involves user modelling and design paradigms.

    Technology

    • Display technologies include plasma, video walls, projected, and back-projected displays.

    Situated Displays

    • Situated displays are public displays that show information relevant to the location.
    • They can be interactive or display-only, and the location of the display matters.

    Hermes

    • Hermes is a situated display system consisting of small displays beside office doors.
    • Handwritten notes are left using a stylus, and the office owner can read notes using a web interface.

    Digital Paper

    • Digital paper is a thin, flexible sheet that can be updated electronically, retaining its display.
    • It is used in PDAs, portables, and notebooks, and increasingly on desktops and home TVs.

    Special Displays

    Random Scan

    • Random scan displays draw lines to be displayed directly, with no jaggies.
    • Lines need to be constantly redrawn, and this technology is rarely used except in special instruments.

    Direct View Storage Tube (DVST)

    • DVST displays are similar to random scan but persistent, with no flicker.
    • They can be incrementally updated but not selectively erased, and are used in analogue storage oscilloscopes.

    Large Displays

    • Large displays are used for meetings, lectures, and other gatherings.

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