# Higher Multimedia Technology - Bitmapped Graphics 1

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This quiz is based on the Bit-mapped graphics topic of the Multimedia Technology Unit related to Higher Computing.

• 1.

### The photo-sensors which are located in digital cameras are known as what?

• A.

Array

• B.

Linear Array

• C.

2-D Array

• D.

DSP

C. 2-D Array
Explanation
The correct answer is 2-D Array. In digital cameras, the photo-sensors are arranged in a two-dimensional grid or array. This allows the camera to capture and process images by converting light into electrical signals. The 2-D array of photo-sensors enables the camera to capture the spatial information of the scene, resulting in a detailed and accurate representation of the image.

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• 2.

### Which of the following compression techniques looks for commonly repeated patterns of bits that are then stored in a look-up table?

• A.

RLE

• B.

LZW

• C.

CLUT

• D.

Intraframe Compression

B. LZW
Explanation
LZW (Lempel-Ziv-Welch) is a compression technique that looks for commonly repeated patterns of bits and stores them in a look-up table. This technique replaces these patterns with shorter codes, resulting in compression of the data. RLE (Run-Length Encoding) is a different compression technique that replaces consecutive repeated characters with a count and a single occurrence. CLUT (Color Look-Up Table) is not a compression technique but a method used in computer graphics to map colors. Intraframe Compression is a compression method used in video coding, but it does not involve the use of a look-up table for storing repeated patterns.

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• 3.

### Which of the following File Formats uses the 'lossy' compression technique to reduce the file size of an image?

• A.

JPEG

• B.

GIF

• C.

PNG

• D.

TIFF

A. JPEG
Explanation
JPEG uses the 'lossy' compression technique to reduce the file size of an image. This means that during the compression process, some data from the original image is permanently discarded in order to achieve a smaller file size. While this results in a reduction in quality, it allows for significant file size reduction, making JPEG a popular format for sharing images online and storing them in digital devices with limited storage capacity.

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• 4.

### Which of the following File Formats is a lossless File Format that was intended to replace GIF by adding extra features?

• A.

JPEG

• B.

GIF

• C.

PNG

• D.

TIFF

C. PNG
Explanation
PNG stands for Portable Network Graphics. It is a lossless file format that was designed to replace GIF. It offers additional features such as support for more colors and transparency. Unlike GIF, PNG supports true color images and does not have a limit on the number of colors used. It also supports alpha channel transparency, which allows for better image quality. Therefore, PNG is the correct answer as it is a lossless file format that was intended to replace GIF while providing additional features.

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• 5.

### RGB typically uses how many bits to represent a colour?

• A.

8

• B.

12

• C.

16

• D.

24

D. 24
Explanation
RGB typically uses 24 bits to represent a color. This is because RGB stands for red, green, and blue, and each of these colors can have 8 bits of information, resulting in a total of 24 bits. With 24 bits, RGB can represent a wide range of colors by combining different intensities of red, green, and blue.

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• 6.

### Which of the following features of Bitmapped Graphics packages allow the user the ability to trick the human eye into seeing colours that cannot be represented, by placing different-coloured blocks of colour?

• A.

Dithering

• B.

Anti-Aliasing

• C.

Increasing Resolution

• D.

Smooting

B. Anti-Aliasing
Explanation
Anti-aliasing is a feature in bitmapped graphics packages that allows the user to trick the human eye into seeing colors that cannot be represented accurately. It does this by placing different-colored blocks of color next to each other, which creates the illusion of a smoother transition between colors. This technique is commonly used to reduce the jagged edges (aliasing) that occur when displaying or printing images with limited color palettes or low resolutions. By blending colors together, anti-aliasing creates the perception of additional colors and improves the overall visual quality of the image.

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• 7.

### CPU's struggle to cope with all the high-end graphics operations. Which device is added to a Graphics Card and is designed to take some of these operations away from the CPU resulting in better systems performance.

• A.

• B.

DSP

• C.

DAC

• D.

GPU

B. DSP
Explanation
A DSP (Digital Signal Processor) is added to a Graphics Card to take some of the high-end graphics operations away from the CPU. By offloading these operations to the DSP, the CPU is relieved of the burden and can focus on other tasks, leading to better system performance.

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