ISDD+Graphics+Compression

media type="custom" key="28309307"


 * Questions**

1. Explain the need for using data compression for bit-mapped images.

2. A screen displays black text on a solid white background. Therefore each pixel can be either Black(B) or White(W).

A representation of the first 32 pixels of the screen is as follows:

BBBBBBBBBBBBWWWWWBBBBBBBBWWBBBBW

Show how this information might be represented if the Run Length Encoding compression technique is used.

3. Below is an small small area of a digital image, zoomed in to show the colours of each pixel

The value of each RGB pixel is shown in the table below:

Show how this section of the image would be stored if it was compressed using RLE compression.

4. How does LZW compression work?

5. What is a CLUT and how does it work?