1.2.4g Images

Why do we still need ASCII if we now have Unicode?

• ASCII is more efficient in terms of memory usage

• Unicode is not compatible with all computer systems

• ASCII is easier to understand and use

• Unicode does not support all characters

Name the two different character sets.

• ASCII and Unicode

• Binary and Hexadecimal

• Alphanumeric and Numeric

• Lowercase and Uppercase

Shift the following number right by 3: 1010 1001

• 0001 0100

• 0101 0010

• 0010 0101

• 1001 1010

Multiply the following number by 2: 11001

• 10010

• 110010

• 10110

• 11100

What is meant by a bitmap image?

• An image file that uses a series of dots or pixels

• An image file that uses vector graphics

• An image file that uses lossless compression

• An image file that uses metadata

What is metadata?

• Data about data

• Data that describes the content of an image

• Data that determines the resolution of an image

• Data that represents the color depth of an image

What is colour depth?

• The number of pixels in an image

• The number of bits used to represent the color of a pixel

• The size of an image file in bytes

• The resolution of an image

How do you calculate the resolution of an image?

• Height in pixels
  x
  Width in pixels

• Colour depth
  x
  File size

• Metadata

  /

  Colour depth

• File size

  /

  Height in pixels

What is the file size of an image with a resolution of 100 pixels by 100 pixels and a colour depth of 16 bits?

• 200 bits

• 20,000 bits

• 20 KB

• 0.02 MB

What word describes the number of bits that determine the range of colours in an image?

• Colour Depth

• Metadata

• Resolution

• Bitmap