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Questions and Answers
What is the primary measurement of the speed of printers?
What is the process by which laser printers fix the toner onto the paper?
What is a characteristic of dot-matrix printers?
What is the typical resolution of ink-jet and bubble-jet printers?
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What is the purpose of the drum in a laser printer?
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What is an advantage of print technology?
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What is a critical feature of printing?
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What is the typical resolution of dot-matrix printers?
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What is the primary advantage of using serif fonts in printed text?
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What is the main benefit of using a page description language in printing?
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What is the primary difference between screen and print resolution?
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Which type of scanner is typically used for desktop publishing?
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What is the primary purpose of using scanners in document storage and retrieval systems?
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What is the typical resolution range of scanners?
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What is the primary advantage of using serif fonts on screen?
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What is the primary purpose of PostScript in printing?
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What type of printer uses special heat-sensitive paper and produces poor quality prints?
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What is the measurement unit of a font size?
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Which font type has square-ended strokes?
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Which type of printer uses a single print head for several paper rolls?
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What is the characteristic of a fixed-pitch font?
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What is the purpose of using uppercase letters?
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What is the advantage of lowercase letters?
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Which font type has splayed ends?
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What type of display technology is associated with wide screens?
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What is a common limitation of projected displays?
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What is unique about situated displays?
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What is the purpose of Hermes, a situated display?
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What is the characteristic of digital paper?
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What is the advantage of using multiple projectors with clever software in projected displays?
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What is the primary purpose of situated displays?
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What is a characteristic of situated displays that are interactive?
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Where are LCD displays often found?
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What is a characteristic of LCD displays?
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What happens when a voltage is applied to the crystal in an LCD display?
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What is a characteristic of Random Scan displays?
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What is similar to Random Scan displays but has persistent images?
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Where are large displays often used?
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What is a benefit of LCD displays?
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What is a characteristic of the top plate in an LCD display?
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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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