1 a key press or combination of key presses sends

This preview shows page 2 - 4 out of 5 pages.

1. A key press (or combination of key presses) sends signals to a keyboard controller. The keyboard controller generates a scan code in response to the input signals from the keys. This code is stored in a buffer, and an interrupt is sent across the bus to the CPU. When the interrupt handler is called, the scan code is transferred to memory for use by software. 2. A font is a collection of characters of a similar style and appearance. In fonts, point size is the distance between the top of the highest character and the bottom of the lowest character in the font. 3. The additive colors are red, green, and blue. The subtractive colors are cyan, magenta, and yellow. Additive colors are used by devices that generate their own light, such as monitors. Subtractive colors are used by devices that rely on reflected light, such as printers. 4. A bitmap is a representation of an image that uses bits to represent each pixel. Chromatic resolution determines the number of bits used to represent each pixel. As chromatic resolution increases, so does the number of bits required to represent each pixel and the entire image. 5. An image description language (IDL) is a text description of an image’s contents. Elements of the image, such as shapes, colors, and positions in the image, are described in a readable language. The advantage of IDL descriptions compared with bitmaps is the
Image of page 2

Subscribe to view the full document.

compactness of the image description. Bitmaps require large amounts of storage and data communication because each pixel is described separately. An IDL describes image components more compactly, thus requiring less storage and less data transmission capacity. 6. JPEG encoding is a method of compressing bitmaps representing still images. MPEG encoding is a method of compressing bitstreams representing moving images. 7. Producing high-resolution graphics in general, and motion video and simulated 3-D in particular, require considerable processing power and updating the display in real time requires an efficient I/O and memory pathway. In addition, most graphics are generated by application programs using standardized graphics interface languages, such as Direct3D and OpenGL. A video controller is essentially a special-purpose computer dedicated to processing OpenGL or Direct3D commands to generate output to a display device. Like any other computer, it needs a CPU to process instructions and primary storage to hold program instructions and data. 8. Liquid crystal displays (LCDs) sandwich a matrix of liquid crystals between polarizing filter panels that block all light except light approaching from a specific angle. The front polarizing panel is rotated 90 degrees from the back panel. Light passing through an uncharged twisted crystal is rotated 90 degrees, which enables light to pass through both panels and the crystal. When an electrical charge is applied to a crystal, it untwists, so light entering the rear panel can’t pass through the front panel. LCDs can display colors if a matrix of RBG color filters is layered over or under the front panel.
Image of page 3
Image of page 4
  • Fall '08
  • Redding,T
  • Pixel, Liquid crystal display, Display technology, Sound card, Inkjet printer, Optical character recognition

{[ snackBarMessage ]}

Get FREE access by uploading your study materials

Upload your study materials now and get free access to over 25 million documents.

Upload now for FREE access Or pay now for instant access
Christopher Reinemann
"Before using Course Hero my grade was at 78%. By the end of the semester my grade was at 90%. I could not have done it without all the class material I found."
— Christopher R., University of Rhode Island '15, Course Hero Intern

Ask a question for free

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern