Podcast
Questions and Answers
Which input device has become the most popular in the modern age?
Which input device has become the most popular in the modern age?
Colour depth refers to the number of bits used to indicate the colours of multiple pixels.
Colour depth refers to the number of bits used to indicate the colours of multiple pixels.
False
What are the three main factors that determine the quality of the image taken by a scanner?
What are the three main factors that determine the quality of the image taken by a scanner?
Colour depth, resolution, dynamic range
The amount of detail an image can hold is referred to as its __________.
The amount of detail an image can hold is referred to as its __________.
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Match the following components to their definitions:
Match the following components to their definitions:
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Which factor does NOT affect the quality of a camera's image?
Which factor does NOT affect the quality of a camera's image?
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Higher ppi or dpi values result in lower quality images.
Higher ppi or dpi values result in lower quality images.
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What is the unit of measurement used for resolution in digital cameras?
What is the unit of measurement used for resolution in digital cameras?
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Study Notes
Input Devices
- Computers use an information processing cycle
- Input devices are used to interact with the computer
- Common input devices include keyboards, mice, touchpads, and scanners
- Touchscreens are now the most common input device, largely due to smartphones
- Other alternative input devices include fingerprint/face recognition and speech-to-type devices for accessibility
Various Input Devices
- Many input devices exist beyond keyboards and mice
- Table 2.1 (image) lists various input devices, their uses, and advantages/disadvantages
Image Scanner Quality
- Three factors determine image quality: colour depth, resolution, and dynamic range
- Colour depth (bit depth): The number of bits used to represent a pixel's colour. Higher bit depth (e.g., 32-bit) results in more vibrant and detailed colours compared to lower bit depth (e.g., 8-bit). (Image 2.1)
- Resolution: The amount of detail in an image, measured in pixels per inch (ppi) or dots per inch (dpi). Higher ppi/dpi leads to higher image quality.
- Dynamic Range: The range of light a scanner can detect—affecting the range of tones and colors produced.
Camera Quality
- Camera quality is determined by three factors: resolution, lens aperture, and focal length
- Resolution: The amount of detail the camera captures, measured in megapixels. Higher megapixels mean more detail.
- Lens Aperture: The maximum opening of the lens. A wider aperture lets in more light, requiring less light for a good image.
- Focal Length: Determines zoom capability. A longer focal length allows for more zoom (e.g., 3x zoom).
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Description
This quiz explores the various input devices used with computers, including keyboards, mice, and touchscreens. It discusses the information processing cycle and factors affecting image quality, such as colour depth and resolution. Test your knowledge on the advantages and disadvantages of these devices.
