1. Font and Point Size: A font is a character design collection, and point size measures character height. 2. Keystroke Recognition: Keystrokes are detected by hardware, translated to binary codes, interpreted by the OS, and processed by applications. 3. Color Types: Additive colors (RGB) are used in monitors, while subtractive colors (CMYK) are applied in color printing, like inkjet and laser printers.
1. Font and Point Size:
- Font: A font is a collection of characters with a consistent and specific design, style, and size. It defines the visual appearance of text, including the shape, size, weight, and other attributes.
- Point Size: Point size refers to the measurement of the height of characters in a font. It is typically measured in points, where one point is equal to 1/72 of an inch. A higher point size generally results in larger and more readable text.
2. Keystroke Recognition Process:
- When a key is pressed on a keyboard, a hardware component detects the keypress and generates an electrical signal.
- The keyboard controller converts this signal into a binary code that represents the specific key pressed.
- The operating system's keyboard driver interprets the binary code and generates a corresponding keycode.
- The application software receives the keycode and processes it to perform the associated action, such as displaying a character or triggering a command.
3. Additive Colors and Subtractive Colors:
- Additive Colors: These are colors created by combining different light colors. The primary additive colors are red, green, and blue (RGB). Devices such as computer monitors, LED displays, and televisions use additive colors.
- Subtractive Colors: These are colors created by subtracting certain wavelengths of light. The primary subtractive colors are cyan, magenta, yellow, and black (CMYK). Subtractive colors are used in color printing, where inks are combined to produce a wide range of colors.
I/O Devices Using Each Kind of Color:
- Additive Colors: Computer monitors, LED displays, TVs, and electronic screens.
- Subtractive Colors: Color printers, including inkjet and laser printers, use CMYK inks to produce a range of colors on paper.